Extreme Makeover! I've remixed Dimonator's version of this project, which used a bunch of sprites, and rewrote the code to use a single cloned object. I then added a few features to make the objects behave a little more like bubbles.
What else would YOU do to help make the bubbles more realistic? Remix this file, and I'll include the best of them in a future episode of Extreme Makeover: Scratch Edition, a segment I do as part of my weekly show on YouTube.