Love it I think a black boarder would be perfect.

Hope you don't mind if I use your idea for some orphan blocks...also, I think a piano key border would look very nice. I might would add two very narrow borders, a solid black about 1" and one of the fabrics you have on your photo about 1 1/2" wide. Love your quilt, can't wait to see what you do.

a black border would be perfect ~ it looks fantastic. what a smart way to use a panel!