I don't think you have to wait. I don't think the rules are defined there one way or the other. In fact, I think its probably better to not wait, that way there's lots of things coming in at once which is cool. The theme definately doens't have to stay the same. In fact, the challenge Max gave you changed from the one I gave him. So I guess its whatever you come up with. I'm dying of anticipation... :-)