You might be able to even find some cheap metal cookie cutters if you want something shaped -- though they also have circular shapes as well. Just make sure it has a handle so that you can pick it up with tongs and not your fingers!

I haven't tried this myself, but I may recommend that if you go with the metal-object-in-the-pan method, place them in the heating pan prior to adding the batter, to give it time to warm up. That way, when the batter hits the shaper, the heat from the shaper will immediately create that "skin" on the pancake and prevent it from leaking out! :)