I haven't tried it yet, but apparently Alton Brown said that you can use those terra cotta landscaping tiles in your oven as a makeshift pizza stone. Since they're only a couple bucks each, I've been tempted to give them a try for fun. The only comments I've heard from others about this method is that the tiles will break rather easily over time - but that is not as big of an issue considering how cheap they are.
Apparently you can also bake stuff in your electric pressure cooker. The cookbook that came with mine has a recipe for cheesecake in it that I also plan on trying. This seems to make sense since you typically need to include a water bath in your oven when making a traditional NY style cheesecake. I'm just a little worried about the cake exploding somehow from the high pressure, lol.