Ever heard of Artist Trading Cards? 2.5 x 3.5 inches. Make them, sign them, trade them. I was first really exposed to them at a local gathering I found through Craigslist last year. Since then I’ve made several, with quite a few more in the works. I hope there’s another meeting sometime soon, I’d like to try trading in person.
This page is the best place to begin reading about them – and get a host of ideas.
My Flickr set is here. Thus far I’m somewhat of a minimalist. The black one with sequins below was my very first card.