Your game of Life
John Conway made up the rules for the game of life by fiddling around until it looked good. Why not make your own game of life and change the rules?
For the unfamiliar, Conway's Game of Life is a cellular automaton. It's pretty neat and you should read the Wikipedia article on it. This implementation was forked from steelerose. I pretty much just stripped it down and added the ability to adjust the constants that govern behavior.