If I would not be half day at work and need to have time after that for my family, I would join as well, but with just 1 week, I don't think I can come with something up that would be better than the last place :)
But this contest gave me an idea... what do you guys think about a Construct2 Version of "Picture Pong"? One starts on a game for about a week, after one week it is sent to the next person to continue work on it with his own ideas, and so on. Might be fun with the right participants :)