I recently found out about this fascinating, albeit somewhat pointless, iPhone app called Percolator. Basically, it's an adjustable filter for photos that turns them into beautiful dots of color. I'm not sure exactly how it works, but I'm guessing it has something to do with pixels.
I made a few Percolator images that I'm using as iPhone wallpaper, and I thought I'd share them here; I think they're pretty neat. See if you can guess what the original picture was!