Heya, I had a few suggestions for your Roll Your Mono-Theme challenge. :)
1. I think it would be better to remove the themes that already have a challenge thread (such as the ones that use only blue Pokemon) because that kind of takes away from the monocolor thread. I know that when they roll a number, they don't know that they'll get that or not, but it feels a bit redundant to have that there, especially if someone for example finished a blue monocolor and then signed up for your challenge and rolled it. That make sense?
2. Not as important, but the name is a bit misleading. Perhaps having it renamed to Roll Your Theme, and remove the mono part, as some of them aren't really mono.
Anyway, not saying you absolutely have to go through with these suggestions (I mean, if they were major problems, the thread wouldn't have been approved) but just something I thought I'd bring up. :) If you like the name change idea, let me know and I can change it for you. If you don't, then that's fine too. XD Again, they're not major problems so it's no big deal. :)