They are great little blocks, I so want to do that and have loads of scraps to do it but promised myself I'd finish some of my UFOs first. The black really makes them POP, the red I don't like as much because it's not as neutral and I like the muslin. If you have a place in mind where it will be used I'd do a specific color like the Red but otherwise I'd do a neutral. You have inspired me to try some. Cute cute cute.