They should be 2.5" x 3.5". This thread actually falls under the Long Beach show (which has since passed) but we will be trading ATCs for the upcoming Houston show!
I just posted the Workshop schedule for Make It University! with Cloth Paper Scissors in Long Beach on the Events page. Long Beach is going to be a lot of fun this time, thanks to all of the artists who will be participating. For those coming to the show, do not forget to bring your ATCs to trade! Click...