oh my goodness... these are so special. I like the look of it just the way you've laid it out, and would consider connecting the blocks sans sashing. They're so beautiful, they need nothing else. A lovely summer quilt. Maybe batted with a heavy white flannel (sheet?). A muslin backing? Perhaps your butterfly fabric could serve as the binding. Or a darker solid fabric... which ever way you go, it will surely be lovely. blessings to you & your mom...