You know what would be fun? Playing word association with sketches instead of words. Of course, there are practical reasons this might not work on a forum... The only way I can see it working is if one person posts a sketch, and then the next person posts a "dibs" for the next pic, then edits the comment later with their sketch. There would have to be a 24 or 48 hour time limit before their dibs expired and the next person could give it a try...