We had to mess with filters for the most recent Photoshop class assignment. Pretty open-ended. And when in doubt, which I usually am, I just go with sheep. (If not sheep, llamas.) And this time? Mutant sheep, complete with a nuclear facility in the background, seemed to be the (un)natural direction to take.
Source pictures from stock.xchng:
Nuclear Power Station 5 (photo by Henriette)