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diff --git a/blockly/generators/dart/colour.js b/blockly/generators/dart/colour.js
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+/**
+ * @license
+ * Visual Blocks Language
+ *
+ * Copyright 2014 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Generating Dart for colour blocks.
+ * @author fraser@google.com (Neil Fraser)
+ */
+'use strict';
+
+goog.provide('Blockly.Dart.colour');
+
+goog.require('Blockly.Dart');
+
+
+Blockly.Dart.addReservedWords('Math');
+
+Blockly.Dart['colour_picker'] = function(block) {
+  // Colour picker.
+  var code = '\'' + block.getFieldValue('COLOUR') + '\'';
+  return [code, Blockly.Dart.ORDER_ATOMIC];
+};
+
+Blockly.Dart['colour_random'] = function(block) {
+  // Generate a random colour.
+  Blockly.Dart.definitions_['import_dart_math'] =
+      'import \'dart:math\' as Math;';
+  var functionName = Blockly.Dart.provideFunction_(
+      'colour_random',
+      ['String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ + '() {',
+       '  String hex = \'0123456789abcdef\';',
+       '  var rnd = new Math.Random();',
+       '  return \'#${hex[rnd.nextInt(16)]}${hex[rnd.nextInt(16)]}\'',
+       '      \'${hex[rnd.nextInt(16)]}${hex[rnd.nextInt(16)]}\'',
+       '      \'${hex[rnd.nextInt(16)]}${hex[rnd.nextInt(16)]}\';',
+       '}']);
+  var code = functionName + '()';
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};
+
+Blockly.Dart['colour_rgb'] = function(block) {
+  // Compose a colour from RGB components expressed as percentages.
+  var red = Blockly.Dart.valueToCode(block, 'RED',
+      Blockly.Dart.ORDER_NONE) || 0;
+  var green = Blockly.Dart.valueToCode(block, 'GREEN',
+      Blockly.Dart.ORDER_NONE) || 0;
+  var blue = Blockly.Dart.valueToCode(block, 'BLUE',
+      Blockly.Dart.ORDER_NONE) || 0;
+
+  Blockly.Dart.definitions_['import_dart_math'] =
+      'import \'dart:math\' as Math;';
+  var functionName = Blockly.Dart.provideFunction_(
+      'colour_rgb',
+      ['String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
+          '(num r, num g, num b) {',
+       '  num rn = (Math.max(Math.min(r, 1), 0) * 255).round();',
+       '  String rs = rn.toInt().toRadixString(16);',
+       '  rs = \'0$rs\';',
+       '  rs = rs.substring(rs.length - 2);',
+       '  num gn = (Math.max(Math.min(g, 1), 0) * 255).round();',
+       '  String gs = gn.toInt().toRadixString(16);',
+       '  gs = \'0$gs\';',
+       '  gs = gs.substring(gs.length - 2);',
+       '  num bn = (Math.max(Math.min(b, 1), 0) * 255).round();',
+       '  String bs = bn.toInt().toRadixString(16);',
+       '  bs = \'0$bs\';',
+       '  bs = bs.substring(bs.length - 2);',
+       '  return \'#$rs$gs$bs\';',
+       '}']);
+  var code = functionName + '(' + red + ', ' + green + ', ' + blue + ')';
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};
+
+Blockly.Dart['colour_blend'] = function(block) {
+  // Blend two colours together.
+  var c1 = Blockly.Dart.valueToCode(block, 'COLOUR1',
+      Blockly.Dart.ORDER_NONE) || '\'#000000\'';
+  var c2 = Blockly.Dart.valueToCode(block, 'COLOUR2',
+      Blockly.Dart.ORDER_NONE) || '\'#000000\'';
+  var ratio = Blockly.Dart.valueToCode(block, 'RATIO',
+      Blockly.Dart.ORDER_NONE) || 0.5;
+
+  Blockly.Dart.definitions_['import_dart_math'] =
+      'import \'dart:math\' as Math;';
+  var functionName = Blockly.Dart.provideFunction_(
+      'colour_blend',
+      ['String ' + Blockly.Dart.FUNCTION_NAME_PLACEHOLDER_ +
+          '(String c1, String c2, num ratio) {',
+       '  ratio = Math.max(Math.min(ratio, 1), 0);',
+       '  int r1 = int.parse(\'0x${c1.substring(1, 3)}\');',
+       '  int g1 = int.parse(\'0x${c1.substring(3, 5)}\');',
+       '  int b1 = int.parse(\'0x${c1.substring(5, 7)}\');',
+       '  int r2 = int.parse(\'0x${c2.substring(1, 3)}\');',
+       '  int g2 = int.parse(\'0x${c2.substring(3, 5)}\');',
+       '  int b2 = int.parse(\'0x${c2.substring(5, 7)}\');',
+       '  num rn = (r1 * (1 - ratio) + r2 * ratio).round();',
+       '  String rs = rn.toInt().toRadixString(16);',
+       '  num gn = (g1 * (1 - ratio) + g2 * ratio).round();',
+       '  String gs = gn.toInt().toRadixString(16);',
+       '  num bn = (b1 * (1 - ratio) + b2 * ratio).round();',
+       '  String bs = bn.toInt().toRadixString(16);',
+       '  rs = \'0$rs\';',
+       '  rs = rs.substring(rs.length - 2);',
+       '  gs = \'0$gs\';',
+       '  gs = gs.substring(gs.length - 2);',
+       '  bs = \'0$bs\';',
+       '  bs = bs.substring(bs.length - 2);',
+       '  return \'#$rs$gs$bs\';',
+       '}']);
+  var code = functionName + '(' + c1 + ', ' + c2 + ', ' + ratio + ')';
+  return [code, Blockly.Dart.ORDER_UNARY_POSTFIX];
+};