I'm not Bender-1729, but maybe I'll do?
Basically, Mafu, the administrator of the Hipjoint forum and Futurama Sutra, post the new picture (usually a movie poster) and people then have a set amount of time to come up with thier version of it using Futurama characters.
After the time expires it's but to a vote on the forum who wins.
Only original drawings, ie no scans, are allowed, but that's just their rules.
Sometime they vote on what picture should be used as inpsiration in the next round.
You can see the previous winners and entries here.