What is the art trade you have in mind?
Could someone trade a watercolor (that's my medium!)
Is it something where like each person does an art & then everyone exchanges addresses and sends the art with 1 stamp to the others?
Did it have a theme?
I have never gone on an ATC (Art...Trade...C?) before but I've seen the results (lots of fun pony art!) and I've always been curious about it.