Heres a shot in the dark, what I might try if the center is quilted, make boarder say 5-6 inches to accient, sandwich, in order backing , medalion, batting, accinet color or boarder. sew left, right, top, bottom, or whatever order you want then quilt this, repeat this process till it is the size you want, some boarders could be fancier etc.
Sure hope that made since, like quilt as you go w/strips but around and around.
Good Luck !! Happy Quilting :)