first read this:
ATC or Artist Trading Cards are miniature works of art about the same size as modern baseball cards, or 2 ½ X 3 ½ inches (63 mm X 89 mm). Cards are produced in various media, including dry media ( threads, pencils sketches, fabric cuts), wet media (watercolor, acrylic paints, etc.), paper media (in the form of collage, papercuts, found objects, etc.) or metal. On the front you create a miniture work of art and on the reverse side you give the information about the artist and the media used to create the card.
We have a few rules for our ATC
1) you sign up
2) follow the theme ...as well as you can
3) make the pattern fit on the material
4) send your card to someone else in the group
5) have lots of fun