If you are thinking of 1/12 inch scale. I recommend finding a cheater cloth backing it with a fusible interfacing and "fixing" the quilt to the bed. Barbie size is much more forgiving and can be pieced and backed with flannel. Too intricate would result with a too thick material like a rug. There is also the consideration of counted cross stitching a bedspread in a quilt pattern. I have made "oriental rugs" for a 1/12 dollhouse before.