Morning and what a lovely quilt. I had embroidered blocks on one of my 1st quilts and I didn't think I should quilt over it but I found if you use the same thread color as the background fabric, it doesn't show as much as you'd think. I did a simple crosshatching which someone else has suggested too. It will make it look like lattice so should be fine. Please show us what you decided to do when you're done as this is such a beautiful quilt.