These are neat Kelley. What size are they? I really like this idea.
The larger ones are Artist Trading Cards and are 2 3.5" x 2.5" and the skinny thin ones (there are 4 stacked together) are "Moo" cards and are 2.75" x 1.10". The idea of the exchange is that you will get back 6 from different people, and then can put them in a pocket in an art journal!