Your favorite color (70% of fabrics must be that color) -- On arrival at a meeting, each person was asked her favorite color, without being told why. Then the challenge was limited to the recorded color, so you couldn't switch to something else that was one color.
President's favorite color -- my sister's guild president presented the challenge "something green". (I won, plus got third place in viewers' choice!)
Initials -- three fabrics only, the colors of which start with your initials. I have done this one twice, with different colors.