Logic Bomb writes: "Wired has a story about Aaron, a computer program under development since 1973 that is supposed to creatively make art. Some people have probably heard about Aaron and its creator Harold Cohen before, since this has been in progress for so long. Aaron is nowhere near finished (will it ever be?), but it's far enough along that Ray Kurzweil thinks everyone should get a look. He has sponsored the creation of an Aaron screensaver for Windows that will continuously create 'original paintings' on your idle PC. You can download a trial version for free."
Aaron is also programmed in LISP
; as I recall it's also one of the many cool things talked about in the truly strange The Secret Guide To Computers