I actually just thought of this idea to take a large pieace of paper, and letting the artist in the artist alley kinda do one big work of art and I dunno, sell it for charity or something.
the idea has been done before, but i dont recall if they sold the super sketch or anything...
if they did, the proceeds usually go back in to the FanimeCon - I still 'think' ARG (the anime resource group that puts together FanimeCon) is still non profit.