I stumbled onto sketchswap.com while looking for a different online sketching program that I couldn't remember the name of. It's kind of an interesting idea: You use an extremely limited set of tools (one size/color/tablet) and sketch something out. When you submit it, your sketch gets shared with another visitor to the site and in one of theirs is returned to you. It's completely anonymous and completely random. My submission is on top, what I received below. If you try it, submit your results in the comments section.