I'm working on making patterns for a digital lava lamp (essentially, making interesting patterns using a 4x10 grid), and I've been looking into cellular automata. I tried implementing some variations on Langton's Ant but it tends to loop in very boring ways. Does anyone have any suggestions for interesting automata on small boards?
The lamp I'm working on can be played with here.
Any suggestions on a more appropriate place to post this question are welcome.
EDIT: By interesting, I mean patterns that work well on small boards. For example, Langton's Ant was not interesting because it always tended to find some static state over such a small board.