ATC = Artist Trading Cards. They measure 2.5 x 3.5 inches.
1. Honour your favourite artist. For instance, if you love Andy Warhol you might like to add a soup can to your ATC.
2. Ref an ATC on Pinterest the leader particularly liked and thought a photo of an ATC could be inspirational. (Example supplied to the group.)
I chose Gauguin and found I still had a large linocut based on a photo Gauguin used for his painting of two women (included in a marvellous book The Painter and the Photograph by Van Deren Coke) so I did some backgrounds and printed one of the faces onto each ATC.