I love it - but agree with those who say you most likely should remove the block that you d not like.
As faras the borders - I would think the piano keys - were you to put them right next to the blocks, would be very distracting and would detract from all your beautiful block building. Think that a narrow (2 to 3 inches) border in a plane medium to lighter tone used in the quilt would be better and then do the keys if you want to make it to size. Kind of along the line of mytwopals thoughts.