I like what was suggested, but I think in the white border my quilting would extend what is going on in the rest of the quilt.
Let's see if I can explain that:
On the 2 longer sides, I would stitch mimicking the 'coins' and on the top and bottom, my stitching would mimic an extension of the coin towers, and the heart towers
heck, I'm going to try to draw it (Luckily I sew straighter than I draw on this computer)