I choose backings a little differently. I first ask myself if I want the quilting threads to show on the backside or if I want just the texture of the quilting to show more than the threads. So I consider what color thread I'm going to be quilting with before I choose the backing. Just my thoughts, but I would probably pick a peachy color solid or marble backing and binding; a peachy/coral color thread to quilt the sashings and coral/peachy blocks; change to a medium pink/fusha thread for some of the blocks, a medium green thread for some of the blocks; a medium navy blue for the remaining blocks. Or if I were quilting an edge to edge pattern I might choose a dark burnt orange thread top and bottom. Just my thoughts.