Drawball is an enormous communal canvas notable for being the online battleground of several forum sites. Users are given a limited amount of ink and must ration it while drawing or wait for it to regenerate.
Drawball has been around since at least November of 2005, and has often served as a battleground for different online communities in trying to take control of the shared artistic landscape.
http://en.wikipedia.org/wiki/Drawball
Pretty hilarious, we should get some action on there beer: