Exactly! example:If those small ones measure 2"x 2", then I would make those piano keys to measure 2" wide also and 6 1/2" long if that's what your border is. I think all you need to do is match one or two of the blues in the original fabric, there are about 4. then I'd add a white or blue or both. Kind of hard when it's not in front of me....audition it with your fabric and see what it looks like, think you'll know real quick.