I use big scraps for the backing, it's an opportunity to be creative and try out a new block. Most of my quilts go to charity, perhaps the new owner will find joy in the back side. The quilt may end up on the floor, couch, who knows. I do know that it will be loved and help keep someone warm. I do the same thing for the RV, I make extra quilts and they get passed to fellow campers. I use one to sit outside on a chilly morning and it keeps me warm and I have two sides to look at and enjoy.