Hahahahaha, what a fun idea :D
Black and white color picker didn't seem like a possibility in my head. I have no idea where did you channel this idea from :'D
I gave it a slightly lower score, just because I can still see all the values, and selecting my color of choice wasn't hard nor annoying. The fact that I couldn't SEE IT was horrific though :D
Great idea, really put a smile on my face when I realized what's it about. Awesome submission <3