http://penguin.phy.bnl.gov/www/xtoys/gallery/gallery.html
Xtoys is a site that contains a set of cellular automata simulators written for Xwindows. The xtoys gallery shows lots of pictures produced by these programs (beware if you have a slow link). The collection covers titles such as Classical Life Cellular Automaton, Fires, Ants, Filmore, and more. Fortunately, there is a description of the theoretical bases for all the images.