It is a Pick A Theme swap, where there are groups of 5, and each person chooses a theme that she wants others to make for her. Very interesting. The PAT 24 is hosted by Jmaraul (Joyce) and it full now. But you should watch for the next one and jump in.
( I get points from Joyce for lassoing new people)
Check this one out, and then watch for the new one. I jsut put some of the ones I made on my gallery last night. If you look in the ATC gallery you can see a bunch of them.