diff --git a/blocks.js b/blocks.js
index 480545d6..f0ddd935 100644
--- a/blocks.js
+++ b/blocks.js
@@ -155,7 +155,7 @@ DialogBoxMorph, BlockInputFragmentMorph, PrototypeHatBlockMorph, Costume*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2014-February-11';
+modules.blocks = '2014-March-31';
 
 
 var SyntaxElementMorph;
@@ -1635,6 +1635,12 @@ SyntaxElementMorph.prototype.showBubble = function (value) {
         morphToShow.silentSetWidth(img.width);
         morphToShow.silentSetHeight(img.height);
         morphToShow.image = img;
+    } else if (value instanceof Costume) {
+        img = value.thumbnail(new Point(40, 40));
+        morphToShow = new Morph();
+        morphToShow.silentSetWidth(img.width);
+        morphToShow.silentSetHeight(img.height);
+        morphToShow.image = img;
     } else if (value instanceof Context) {
         img = value.image();
         morphToShow = new Morph();
diff --git a/history.txt b/history.txt
index 4c4201ed..1399ba67 100755
--- a/history.txt
+++ b/history.txt
@@ -2107,3 +2107,4 @@ ______
 140331
 ------
 * Objects: experimental “wardrobe” and “jukebox” reporters in dev mode
+* Blocks, Objects: display costume thumbnails in speech/thought/value bubbles and watcher cells
diff --git a/objects.js b/objects.js
index 37daa694..a6d2c9a8 100644
--- a/objects.js
+++ b/objects.js
@@ -5058,6 +5058,12 @@ SpriteBubbleMorph.prototype.dataAsMorph = function (data) {
         contents.silentSetWidth(img.width);
         contents.silentSetHeight(img.height);
         contents.image = img;
+    } else if (data instanceof Costume) {
+        img = data.thumbnail(new Point(40, 40));
+        contents = new Morph();
+        contents.silentSetWidth(img.width);
+        contents.silentSetHeight(img.height);
+        contents.image = img;
     } else if (data instanceof HTMLCanvasElement) {
         contents = new Morph();
         contents.silentSetWidth(data.width);
@@ -5900,6 +5906,12 @@ CellMorph.prototype.drawNew = function () {
             this.contentsMorph.silentSetWidth(img.width);
             this.contentsMorph.silentSetHeight(img.height);
             this.contentsMorph.image = img;
+        } else if (this.contents instanceof Costume) {
+            img = this.contents.thumbnail(new Point(40, 40));
+            this.contentsMorph = new Morph();
+            this.contentsMorph.silentSetWidth(img.width);
+            this.contentsMorph.silentSetHeight(img.height);
+            this.contentsMorph.image = img;
         } else if (this.contents instanceof List) {
             if (this.isCircular()) {
                 this.contentsMorph = new TextMorph(