Below is a description found at http://www.artist-trading-cards.ch/ of something that I've known about for a while, but wasn't sure if the concept would be interesting to the students. I'm posting this because the idea is growing rapidly among young artists, both students and non-. Several teachers have formed trading groups that allow artists from around the world to exchange ATC's. Several schools have created trading societies within their own schools. I like the idea because the obvious advantage of exchanging ideas and techniques. In addition, the small dimension of the card increases the students' desire to fully develop the design. (Many artists have a tendency to be satisfied with a design that is under developed.)
ARTIST TRADING CARDS are miniature works of art created on 2 ½ X 3 ½ inch or 64 X 89 mm card stock. they are originals, small editions and, most importantly, self-produced. anybody can produce them.the idea is that you trade them with other people who produce cards, either at TRADING SESSIONS or wherever you meet another ATC trader in person. it is important that you meet other people in person to trade - i.e. it is ok to trade by mail or to participate in editions but the main purpose of this performance is the trading session and the personal meeting. It's not about money: participants in trading sessions and editions should not be charged any money: the point of the project is the exchange of cards as well as personal experience.
Some of the many ATC sites: (Make sure you see the galleries.)
Let me know if you are interested.