This solution might sound unusual, but the quilt I have is very old and I haven't seen another like it. It's a grandmother's flower garden my grandmother pieced years ago. The backing fabric was laid out right-side down and about 6" was folded back on every side so that the top fit on it exactly. The top was blind stitched to it around all the outer hexagon edges. There is no binding on the quilt, and only a very thin flannel batting that doesn't extend to the quilt edge. The edges are squared at an angle to follow the hexagon shape.