In my local art gallery, during one of those "pay whatever you want night" (yes I'm cheap) , I saw a game called Spore. It was created by the guy who made Sim City and the Sims. I was wondering why a computer game would be consider artistic... so I downloaded it at home and tried it out myself. (they have a demo version of the creature creator from http://www.spore.com/trial)
At first, it looked kind of silly and childish, but after making a few creatures I was totally amazed by the "generated procedure" of the game. I didn't imagine this kind of thing was possible. As advertised, it's a creature creator... but it's the kind of creator that will let your imagination rein.
The game is not finish yet, when it's done, it will allow you to play like Civilization, or Startcraft but with the creatures created by you and other people playing the same game. It's quite a concept. I'll post some of the creatures I created on this thread. You may want to try it out yourself and post your creatures here (you can use the upload attachment link).