diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 66b8dda4..03276e9f 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -126,6 +126,34 @@ pub fn category(kind: &str) -> &'static str {
     }
 }
 
+/// A layout's gallery picture: the graphic drawn with sample nodes (or `nodes`) in a 320 × 200 pt
+/// group at the origin, in the style and colours given, with no text in the samples.
+pub fn preview(kind: &str, style: &str, colors: &str, nodes: Option<&[DiagramNode]>) -> Shape {
+    let sample = |levels: &[u8]| -> Vec<DiagramNode> { levels.iter().map(|l| DiagramNode { level: *l, ..Default::default() }).collect() };
+    let nodes = match nodes {
+        Some(n) if !n.is_empty() => n.to_vec(),
+        _ => match category(kind) {
+            "hierarchy" => sample(&[0, 1, 2, 2, 1]),
+            "matrix" => sample(&[0, 0, 0, 0, 0]),
+            "list" if kind != "blockList" && kind != "tableList" => sample(&[0, 1, 0, 1, 0, 1]),
+            _ => sample(&[0, 0, 0, 0]),
+        },
+    };
+    let d = Diagram { kind: kind.into(), nodes, style: style.into(), colors: colors.into(), ..Default::default() };
+    let area = Xfrm::new(0.0, 0.0, 320.0, 200.0);
+    let mut children = layout(&d, area);
+    for (k, c) in children.iter_mut().enumerate() {
+        c.id = ShapeId(10_000 + k as u32);
+    }
+    Shape {
+        id: ShapeId(9_999),
+        name: "SmartArt preview".into(),
+        xfrm: Some(area),
+        kind: ShapeKind::Group { children, child: area },
+        ..Default::default()
+    }
+}
+
 pub fn is_kind(k: &str) -> bool {
     LAYOUTS.iter().any(|(id, _)| *id == k)
 }
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 1d2b8f3a..94130974 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -553,37 +553,79 @@ pub fn cref_param(c: &deckcraft_model::ColorRef) -> Value {
 
 /// Convert to SmartArt: the layouts by category, three to a row; a click converts the selected
 /// text.
-fn smartart_gallery(app: &mut SlideApp, ui: &mut Ui) {
+/// A layout gallery grouped by category, each layout as a small cached picture with its name.
+/// Clicking runs `cmd` with `{"kind": …}` plus `extra`; hovering shows the layout larger, drawn
+/// with `nodes` (the selected graphic's outline) when given: a live preview without touching the
+/// document.
+fn smartart_gallery(
+    app: &mut SlideApp,
+    ui: &mut Ui,
+    cmd: &str,
+    extra: Value,
+    current: &str,
+    style: &str,
+    colors: &str,
+    nodes: Option<&[deckcraft_model::DiagramNode]>,
+) {
     use deckcraft_engine::cmd::smartart::{LAYOUTS, category};
-    ui.set_min_width(420.0);
-    for (cat, title) in [
-        ("list", "List"),
-        ("process", "Process"),
-        ("cycle", "Cycle"),
-        ("hierarchy", "Hierarchy"),
-        ("relationship", "Relationship"),
-        ("matrix", "Matrix"),
-        ("pyramid", "Pyramid"),
-        ("picture", "Picture"),
-    ] {
-        let kinds: Vec<(&str, &str)> = LAYOUTS.iter().copied().filter(|(k, _)| category(k) == cat).collect();
-        if kinds.is_empty() {
-            continue;
-        }
-        ui.label(egui::RichText::new(title).strong());
-        egui::Grid::new(("smartart_gallery", cat)).num_columns(3).spacing([6.0, 2.0]).show(ui, |ui| {
-            for (i, (k, label)) in kinds.iter().enumerate() {
-                if ui.add_sized([136.0, 22.0], egui::Button::new(*label)).clicked() {
-                    run(app, "smartArt.fromText", json!({"kind": k}));
-                    ui.close();
-                }
-                if i % 3 == 2 {
-                    ui.end_row();
-                }
+    ui.set_min_width(440.0);
+    let slide = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
+    egui::ScrollArea::vertical().max_height(520.0).show(ui, |ui| {
+        for (cat, title) in [
+            ("list", "List"),
+            ("process", "Process"),
+            ("cycle", "Cycle"),
+            ("hierarchy", "Hierarchy"),
+            ("relationship", "Relationship"),
+            ("matrix", "Matrix"),
+            ("pyramid", "Pyramid"),
+            ("picture", "Picture"),
+        ] {
+            let kinds: Vec<(&str, &str)> = LAYOUTS.iter().copied().filter(|(k, _)| category(k) == cat).collect();
+            if kinds.is_empty() {
+                continue;
             }
-        });
-        ui.separator();
-    }
+            ui.label(egui::RichText::new(title).strong());
+            egui::Grid::new(("smartart_gallery", cat)).num_columns(4).spacing([6.0, 6.0]).show(ui, |ui| {
+                for (i, (k, label)) in kinds.iter().enumerate() {
+                    let ctx = ui.ctx().clone();
+                    let thumb = app.session.active().and_then(|d| app.textures.smartart(&ctx, &d.doc, slide, k, style, colors, None, 192));
+                    let r = ui
+                        .vertical_centered(|ui| {
+                            ui.set_width(100.0);
+                            let r = match &thumb {
+                                Some(t) => {
+                                    ui.add(egui::Button::image(egui::Image::new(t).fit_to_exact_size(egui::vec2(96.0, 60.0))).selected(*k == current))
+                                }
+                                None => ui.add_sized([96.0, 60.0], egui::Button::new("").selected(*k == current)),
+                            };
+                            ui.add(egui::Label::new(egui::RichText::new(*label).small()).truncate().selectable(false));
+                            r.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, *label));
+                            r.on_hover_text(*label)
+                        })
+                        .inner;
+                    if r.hovered() {
+                        let preview = app.session.active().and_then(|d| app.textures.smartart(&ctx, &d.doc, slide, k, style, colors, nodes, 480));
+                        if let Some(t) = preview {
+                            r.show_tooltip_ui(|ui| {
+                                ui.add(egui::Image::new(&t).fit_to_exact_size(egui::vec2(320.0, 200.0)));
+                            });
+                        }
+                    }
+                    if r.clicked() {
+                        let mut args = extra.clone();
+                        args["kind"] = json!(k);
+                        run(app, cmd, args);
+                        ui.close();
+                    }
+                    if i % 4 == 3 {
+                        ui.end_row();
+                    }
+                }
+            });
+            ui.separator();
+        }
+    });
 }
 
 fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
@@ -697,7 +739,7 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                     }
                 });
                 let r = icon_toggle(ui, Icon::SmartArt, "Convert to SmartArt", enabled(app, "smartArt.fromText"), false);
-                egui::Popup::menu(&r).show(|ui| smartart_gallery(app, ui));
+                egui::Popup::menu(&r).show(|ui| smartart_gallery(app, ui, "smartArt.fromText", json!({}), "", "", "", None));
             });
         });
     });
@@ -2666,12 +2708,9 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         let (r, _) = small_button_ex(ui, Icon::Layout, "Layouts", gid.is_some(), false, true);
+        let outline = sel.as_ref().map(|(_, d)| d.nodes.clone());
         egui::Popup::menu(&r).show(|ui| {
-            for (k, label) in deckcraft_engine::cmd::smartart::LAYOUTS {
-                if ui.selectable_label(kind == k, label).clicked() {
-                    run(app, "smartArt.layout", json!({"id": gid, "kind": k}));
-                }
-            }
+            smartart_gallery(app, ui, "smartArt.layout", json!({"id": gid}), &kind, &style, &colors, outline.as_deref());
         });
         let (r, _) = small_button_ex(ui, Icon::Layout, "Convert", gid.is_some(), false, true);
         egui::Popup::menu(&r).show(|ui| {
diff --git a/crates/ui-egui/src/smartart_tests.rs b/crates/ui-egui/src/smartart_tests.rs
index 9d88e465..0e668439 100644
--- a/crates/ui-egui/src/smartart_tests.rs
+++ b/crates/ui-egui/src/smartart_tests.rs
@@ -68,10 +68,44 @@ fn home_convert_to_smartart_gallery_converts_the_text() {
     h.run_steps(3);
     h.get_by_label("Convert to SmartArt").click();
     h.run_steps(3);
-    h.get_by_label("Basic Block List").click();
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Basic Block List").click();
     h.run_steps(3);
     let st = h.state().session.active().unwrap();
     let (_, d) = deckcraft_engine::cmd::smartart::selected(st).expect("the text became a SmartArt graphic");
     assert_eq!(d.kind, "blockList");
     assert_eq!(d.nodes.len(), 3);
 }
+
+#[test]
+fn layout_gallery_shows_cached_pictures_and_previews_on_hover() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.smartArt", &json!({"kind": "process", "items": ["Plan", "Build", "Ship"]})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.tab = "SmartArt Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Layouts").click();
+    h.run_steps(3);
+    let first = h.state().textures.smartart_cached();
+    assert!(first >= deckcraft_engine::cmd::smartart::LAYOUTS.len().min(8), "gallery pictures were drawn: {first}");
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Vertical Box List").hover();
+    h.run_steps(3);
+    if let Ok(path) = std::env::var("SMARTART_GALLERY_PNG") {
+        h.render().expect("render").save(path).unwrap();
+    }
+    let hovered = h.state().textures.smartart_cached();
+    assert!(hovered > first, "hovering drew a preview of the graphic's own outline");
+    h.run_steps(3);
+    assert_eq!(h.state().textures.smartart_cached(), hovered, "pictures are cached, not redrawn every frame");
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Vertical Box List").click();
+    h.run_steps(3);
+    let st = h.state().session.active().unwrap();
+    assert_eq!(deckcraft_engine::cmd::smartart::selected(st).unwrap().1.kind, "verticalBoxList");
+}
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 02c56925..e60aafbe 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -46,10 +46,58 @@ pub struct Textures {
     /// Canvas renders so far (tests, performance checks).
     pub canvas_renders: u64,
     thumbs: HashMap<usize, Entry>,
+    /// SmartArt gallery pictures by layout, style and colours (and, for hover previews, the
+    /// outline's hash).
+    smartart: HashMap<String, TextureHandle>,
     clock: u64,
     pub last_render_ms: f64,
 }
 
+impl Textures {
+    /// SmartArt gallery pictures cached so far (tests).
+    pub fn smartart_cached(&self) -> usize {
+        self.smartart.len()
+    }
+
+    /// A SmartArt layout drawn small for a gallery (`nodes` for a preview of the selected
+    /// graphic's own outline), cached; drawn with the active presentation's theme.
+    pub fn smartart(
+        &mut self,
+        ctx: &egui::Context,
+        p: &deckcraft_model::Presentation,
+        slide: usize,
+        kind: &str,
+        style: &str,
+        colors: &str,
+        nodes: Option<&[deckcraft_model::DiagramNode]>,
+        width_px: u32,
+    ) -> Option<TextureHandle> {
+        let mut key = format!("{kind}|{style}|{colors}|{width_px}");
+        if let Some(n) = nodes {
+            use std::hash::{Hash, Hasher};
+            let mut h = std::collections::hash_map::DefaultHasher::new();
+            for x in n {
+                (x.text.as_str(), x.level).hash(&mut h);
+            }
+            key.push_str(&format!("|{:x}", h.finish()));
+        }
+        if let Some(t) = self.smartart.get(&key) {
+            return Some(t.clone());
+        }
+        let mut s = p.slides.get(slide).or_else(|| p.slides.first())?.as_ref().clone();
+        let g = deckcraft_engine::cmd::smartart::preview(kind, style, colors, nodes);
+        let id = g.id;
+        s.shapes = vec![g];
+        let img = deckcraft_render::render_shape(p, &s, id, width_px as f64 / 336.0)?;
+        let tex = ctx.load_texture(format!("smartart-{key}"), to_color_image(&img, false), TextureOptions::LINEAR);
+        if self.smartart.len() > 300 {
+            self.smartart.clear();
+        }
+        self.smartart.insert(key, tex.clone());
+        Some(tex)
+    }
+}
+
 pub fn to_color_image(img: &Image, grayscale: bool) -> ColorImage {
     let w = img.width as usize;
     let h = img.height as usize;
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index ddd7a46b..63ab3934 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -117,6 +117,9 @@ pub fn small_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, sele
     let arrow_w = if split { 12.0 } else { 0.0 };
     let w = 24.0 + tw + arrow_w;
     let (rect, resp) = ui.allocate_exact_size(vec2(w, 22.0), if enabled { Sense::click() } else { Sense::hover() });
+    if !label.is_empty() {
+        resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, label));
+    }
     let painter = ui.painter_at(rect);
     let main_rect = Rect::from_min_max(rect.min, pos2(rect.max.x - arrow_w, rect.max.y));
     let main_resp =