It is a lovely quilt! Have you thought about quilting the white areas with contrasting/complimentary thread? I think that would solve your problem without making it look like you've added something else to solve a problem. I speak from experience.......just yesterday I had a quilt returned to me...one that I hated when I sent it to the quilter. It had too large of a contrast in color in several areas of the quilt. The quilter made that quilt into a gorgeous work of art by using contrasting/complimentary thread in the large 'ugly' areas. I wish you could see my quilt now!!