Hi,
well its a huge subject. There are plenty of things on this board if you dig. Try searching for anything by "mind", downloading , running. Try searching for chladni too. Then pop over to Paul Bourkes website and have a look at IFS. Then look up L-systems (lindenmeyer systems) on his web pages too. Almost everything in 4ks (except music) is procedural. Try searching for structure synthesis. MOst 64ks are procedural and all contain some procedural elements.
Basically its a huge subject.
Chris