I'm not sure about ATCs (artist trading cards). First, they're pretty small and fiddly. I have tried to make a few, but I have found it a challenge to make anything interesting. Also, what am I going to do with them? Sure, they could be framed, but I think the idea is that you collect them in a book. I don't need more stuff. But, I couldn't resist this little challenge from Mail Me Some Art. Replace actual heads on images with postage stamps? Too much fun. Here are my results.