Sometimes I just don't have a backing that works for the quilt so I've also used orphan blocks or cutoffs to make new blocks for the back. I've also used them to extend the size of the quilt like in my borders. Here's one I've done. Used some of the cutoffs to make diamonds along the border and cutoffs to make pinwheels on the back side. Even used the last of the scraps to make a stuffed elephant to go with it as that was her theme for her new baby boy.