You upload art and designs to them and they sell t-shirts, greeting cards, coffee mugs, stickers, and a whole bunch of other stuff. There is, of course, a commission given to the artist (me).
So check out the shop and see if there is anything you like. The store navigation is a little quirky... basically look at the different designs on the right column. Some of the Product Lines on the right have multiple designs under the title, while others only have one design on multiple products.
Anyhow, I'll be posting link to some of my favorite designs from time to time. Today I'll start with a "Motivational" design I thought up while I was sitting on the couch.
The text says: Exercise - Sometimes you just need the proper motivation.