Is there anything special I need to do to prep flower pots if I wanted to bake in them?

I saw a cute idea of making individual cakes in the 4" clay pots but I wanted to make sure it didn't end up on the disater board when i attempted it.

Thanks in advance!!!!
Marie

Someone asked this on the wilton site and another person said that you can just make sure that the pot isn't from Mexico because it contains Lead.