Our group did a "paint chip challenge" whereby each member draws out a paint chip that has a selection of three colours and then you could add in black and white to make a total of 5 colours only. All who took part really enjoyed the challenge and came up with some interesting ideas.
Another challenge was that we were each given a fat quarter of the same fabric and had to feature the fabric in something.
We were also given a set of clues over a 5 week period and could interpret each clue as we thought appropriate - we could make any item so long as each clue was evident. That one produced some interesting items.
Have fun picking a suggestion and let us know what you decide upon. Enjoy the challenge. They are fun.