Just a thing to bear in mind - color was not a REQUIREMENT, but a suggestion. I wanted to push people to use color because A: it can be its own form of contrast, and can, when used properly, encourage abstraction, and B: we APUGians tend to heavily emphasize black-and-white over color, so I wanted to create a challenge that would push people a bit, get them out of their comfort zones. Not that black-and-white is easy, but it's "easy" for us because it's the fallback position - it's how we learned photography first, it's the easier thing to do at home (more wiggle room, times and temperatures don't have to be as short or as high, etc), and it's cheaper if you don't have the investment in development machinery (which can be a significant initial hurdle).