I finished my two blocks for Sandy yesterday. The first two colored scraps I picked up were BLUE, so that's the monochromatic I used. It required me to dump the whole, kitchen-sized waste can of scraps on the queen bed and sort out all the blue, and the few neutrals. Making a block that is 13" takes quite a while I discovered!
Hope these fit you plan, Sandy!
Meanwhile I'm still cogitating about the "squares" border on the Liberated Round Robin gig. Think I'll go with a liberated checkerboard.