Here are two dandy hacks that show The Power Of AppleScript™.
Dancing Desktop move the icons on the desktop around the screen. When an icon hits the edge is relflects off in another direction.
HackMan is PacMan for your desktop. A little HackMan runs around on your desktop eating all the icons it finds there (it does leave the disk and trash icons for you).
Both of these hacks are written completely in AppleScript, taking advantage of the scriptable Finder (and an osax called Jon's commans for the sound in HackMan).
