slang is a small hack I built the other day. Inspired by Dan Catt's Flambient, it allows you to apply an interesting pixelation effect to any image. I use it to generate new backgrounds for my desktop from screenshots of the same. You can kind of make out the iOS simulator on this one:
It's a simple CoffeeScript implementation that you can find on github. I would like to have the image processing running in a background web worker, but unfortunately, canvas and web workers are mutually exclusive at this point.