Robert Hodgin who presented at this year's Flash on the Beach (see http://www.flashonthebeach.com/speakers/index.php?pageid=1129 ) created this iTunes Visualizer all in code - clever, beautiful, hypnotic & beyond inspiring.
"The thing that is most interesting to me about the video is that it was nearly entire created with code. I say nearly because I use a couple premade particle images but every other aspect (aside from the music, of course) was made possible with code. And randomness. If I were to recompile the code over and over, the resulting videos would all be unique."