To "complicate" the challenge still more, and to make it of possibly greater benefit, what do you say we require every participant to compose a piece on, in addition to their assigned theme, their own theme? Later we can ask each theme's original and assigned composers to post their compositions at the same time (so that none influence each other) such that we can see the different ways each composer tackles the same theme. I would suggest a revised deadline for this more difficult challenge, probably something like 6 weeks at least. What do you say?