This is taken directly from their homepage (and I couldn't describe it any better than they did):
Do you like sending and receiving snail mail? Do you like writing letters, making crafts, or putting together fun packages? You should try swapping! Swap-bot is a online service that organizes group swaps and a community of creative individuals. Swap-bot takes the hassle out of participating in group swaps by organizing all of the participant information and doing all of the partner assignments. On Swap-bot, you can host swaps, join swaps, and chat with other swappers from all over the world. Give it a try!
I've been a member for for about a year and a half now and I have to say that it is so much fun! I go through spells where I'm not swapping but then I find a new hobby and check Swap-bot to see if there are any swaps pertaining to my latest art endeavor. There is always some kind of swap going on that I am interested in. That's why I've labeled this post part one because I know I won't be able to cover everything I've swapped in one post.
So I had to dig into my archives (yes swap-bot keeps track of everything you've ever swapped) and my first one was very easy. It was entitled "Quick Swap - Just Because Card Swap". I signed up for a few others like this just to get my feet wet. I signed up for a few postcard swaps and button swaps. Then I discovered ATC's.
ATC - Artist Trading Card. It's usually made on heavy card stock and measures 2 1/2" x 3 1/2". They measure the size of a baseball card and are usually but in sleeves of that size to ship. I made and traded these for quite some time because it's like your own mini canvas. You can paint, draw and doodle on them. You can "scrapbook" on them. You can make them out of other things such as fabric or felt. I got the idea to "carve" out foam board and make a frame around mine and I loved the result. (Those are real sea shells)
I have also made ATC's out of fabric, paint and flat marbles:
For these I covered a piece of foam board with fabric then carved out the holes where I wanted the flat marbles to go, glued them in there and the put duck tape around the boarder. Then used puffy paint to outline and decorate a little more.