I had a lot of fun making environments where they would cycle on their own. I can't really remember what I did too well since it was a few months ago, but I think I divided the game into three parts with the ground tool, and set up a fountain somewhere. I had grass that would absorb and take over all the water, and somewhere there was a flame that would never run out that the grass would eventually reach and get burned out. The water would pour again, and eventually would reach some small remnant of the grass, which would spread and get burnt again. I just thought creating that kind of a cycle that ran on its own was fun. Just the whole control over any kind of scenario with whatever you want to mix is a fun thing to do. that is cool and so is fire! sweet