I made a quilt just like that about three years ago. My centers were all 5 sided black, all the pieces were smaller, and I had cornerstones of tiny pieces, too. 2.5 inch squares, and some had 11 pieces. Then I bordered it with a narrow red strip of many different red pieces and added piano keys of many different colors, sizes and widths. I got second place for viewer's choice at our quilt show. I think the black really makes it stand out, and this shows what you can do with all those scraps that usually get thrown away.
Yours is beautiful.