diff --git a/editor/extract_colorscheme.py b/editor/extract_colorscheme.py
index 2ab2353610..7d34f36013 100755
--- a/editor/extract_colorscheme.py
+++ b/editor/extract_colorscheme.py
@@ -10,7 +10,8 @@ def run():
         for f in files:
             if f.endswith('.rs') and f != 'colors.rs':
                 for k, v in read_file(os.path.join(path, f)):
-                    # TODO Check for double-definitions
+                    if k in mapping:
+                        raise ValueError('Color {} defined twice'.format(k))
                     mapping[k] = v
 
     with open('src/init_colors.rs', 'w') as f:
diff --git a/editor/src/colors.rs b/editor/src/colors.rs
index 88307c7745..929a56562d 100644
--- a/editor/src/colors.rs
+++ b/editor/src/colors.rs
@@ -38,6 +38,10 @@ impl ColorScheme {
         self.map[name]
     }
 
+    pub fn get(&self, name: &str) -> Color {
+        self.map[name]
+    }
+
     // Just for the color picker plugin, that's why the funky return value
     pub fn color_names(&self) -> Vec<(String, ())> {
         let mut names: Vec<(String, ())> = self.map.keys().map(|n| (n.clone(), ())).collect();
diff --git a/editor/src/plugins/edit/draw_neighborhoods.rs b/editor/src/plugins/edit/draw_neighborhoods.rs
index 5756d75608..036d4d7469 100644
--- a/editor/src/plugins/edit/draw_neighborhoods.rs
+++ b/editor/src/plugins/edit/draw_neighborhoods.rs
@@ -126,7 +126,7 @@ impl Plugin for DrawNeighborhoodState {
         }
         for pt in &pts {
             g.draw_circle(
-                ctx.cs.get_def("neighborhood point", Color::RED),
+                ctx.cs.get("neighborhood point"),
                 &Circle::new(*pt, POINT_RADIUS),
             );
         }
diff --git a/editor/src/plugins/edit/scenarios.rs b/editor/src/plugins/edit/scenarios.rs
index 8ba6d3a6ff..61597fa6e0 100644
--- a/editor/src/plugins/edit/scenarios.rs
+++ b/editor/src/plugins/edit/scenarios.rs
@@ -3,7 +3,7 @@ use crate::plugins::{
     choose_intersection, choose_neighborhood, choose_origin_destination, input_tick,
     input_weighted_usize, load_scenario, Plugin, PluginCtx,
 };
-use ezgui::{Color, GfxCtx, LogScroller, Wizard, WrappedWizard};
+use ezgui::{GfxCtx, LogScroller, Wizard, WrappedWizard};
 use map_model::Map;
 use piston::input::Key;
 use sim::{BorderSpawnOverTime, Neighborhood, Scenario, SeedParkedCars, SpawnOverTime};
@@ -78,11 +78,7 @@ impl Plugin for ScenarioManager {
             }
             ScenarioManager::EditScenario(_, wizard) => {
                 if let Some(neighborhood) = wizard.current_menu_choice::<Neighborhood>() {
-                    g.draw_polygon(
-                        ctx.cs
-                            .get_def("neighborhood polygon", Color::rgba(0, 0, 255, 0.6)),
-                        &neighborhood.polygon,
-                    );
+                    g.draw_polygon(ctx.cs.get("neighborhood polygon"), &neighborhood.polygon);
                 }
                 wizard.draw(g, ctx.canvas);
             }
diff --git a/editor/src/plugins/sim/diff_all.rs b/editor/src/plugins/sim/diff_all.rs
index 4e0286f289..c81fb30b9e 100644
--- a/editor/src/plugins/sim/diff_all.rs
+++ b/editor/src/plugins/sim/diff_all.rs
@@ -1,6 +1,6 @@
 use crate::objects::Ctx;
 use crate::plugins::{Plugin, PluginCtx};
-use ezgui::{Color, GfxCtx};
+use ezgui::GfxCtx;
 use geom::Line;
 use map_model::LANE_THICKNESS;
 use piston::input::Key;
@@ -46,11 +46,7 @@ impl Plugin for DiffAllState {
 
     fn draw(&self, g: &mut GfxCtx, ctx: &Ctx) {
         for line in &self.lines {
-            g.draw_line(
-                ctx.cs.get_def("diff agents line", Color::YELLOW),
-                LANE_THICKNESS,
-                line,
-            );
+            g.draw_line(ctx.cs.get("diff agents line"), LANE_THICKNESS, line);
         }
     }
 }
diff --git a/editor/src/plugins/view/show_route.rs b/editor/src/plugins/view/show_route.rs
index 8631c8890d..cfeba60538 100644
--- a/editor/src/plugins/view/show_route.rs
+++ b/editor/src/plugins/view/show_route.rs
@@ -80,7 +80,7 @@ impl Plugin for ShowRouteState {
             State::DebugAllRoutes(_, traces) => {
                 for t in traces {
                     g.draw_polygon(
-                        ctx.cs.get_def("route", Color::rgba(255, 0, 0, 0.8)),
+                        ctx.cs.get("route"),
                         &t.make_polygons_blindly(LANE_THICKNESS),
                     );
                 }
diff --git a/editor/src/render/intersection.rs b/editor/src/render/intersection.rs
index b7eca634ff..6c26c43d38 100644
--- a/editor/src/render/intersection.rs
+++ b/editor/src/render/intersection.rs
@@ -183,7 +183,7 @@ pub fn draw_signal_cycle(
 
     for crosswalk in &draw_map.get_i(cycle.parent).crosswalks {
         if !hide_crosswalks.contains(&crosswalk.id1) {
-            crosswalk.draw(g, cs.get_def("crosswalk", Color::WHITE));
+            crosswalk.draw(g, cs.get("crosswalk"));
         }
     }
     for t in &cycle.priority_turns {