WOW! What a gorgeous quilt! I don't think a piano key border would work as well as a plain border, maybe pick your favorite color in the quilt and use that? I would put on a white border, then a colored border, then maybe another white border. The quilt is colorful, and beautiful, but I think a piano border would be too busy. That is just my humble opinion. Truly a wonderful quilt you have made, either way!