1) The Chair

provide a model of a chair - then anything goes. Create a scene that tells a story but it must some how involve the chair (or a different object).

Got the idea from a uni project we had which was based on a desk. This would leave room for people to make the idea there own.

2) Caricature

I think a caricature challenge would bring some really funny entries. - could be off ourselves or famous peeps. Well as long as it not Chef Gordon Ramsay

I`ll think of some others aswell ...