I have a really beautiful simulation of ant foraging I coded up in Processing a while back. I'm currently porting all of this kind of work I have done to Python (via Pyglet) and will have to remember to post a link to it here when it's done. (See my profile info for linke to a very small sample.)

* Edit: "A very small sample" of the kind of thing I've been doing. No samples of the ant simulation to share just yet...