This is an old project
http://mute-net.sourceforge.net/
but the idea is still sound. It's routing inspired by ant colonies, for anonymous file sharing.
Ants and their colonies are so fascinating to me that I'm constantly saddened by Maxis's decision to not remake SimAnt. I'd be happy with a SimBee, too.
Ant colony systems are really interesting! It's fascinating how distributed creatures can communicate and, with a simple set of rules, converge on a good solution.
Last year I did a GPU programming project involving an ant-colony-like simulation. Based on the idea that ants have immediate knowledge only of their neighborhood, it's a simulation that works well with GPU fragment-shader-based parallelization:
See http://mute-net.sourceforge.net/howAnts.shtml for an explanation of the algorithm