A couple of ideas--When I did the AAQI project I learned how to put corner triangles on the back of the quilt.
1. Cut a square (about 3-4 inches depending on the size of your quilt) for each corner.
2. Fold the square in half along the diagonal.
3. After the binding is sewn on, place folded triangle on the back of the quilt in the corners with straight edges of triangle flush with edges of seam allowance.
4. Sew triangles along binding seam, but not tight into the corners (leave 1/4 inch or so.
5. Sew binding down as usual. You will have 4 little corner pockets to insert a dowel or if small enough a straw. Inserting a dowel (or straw or pencil) in the bottom pair of pockets gives the quilt some stabiltiy. These quilts are so lightweight they can now be hung on a small pin or nail. I have used old sewing machine needles as a "nail"--sharp point and sturdy shaft. If a quilt has an obvious top and bottom I have put in only 2 triangles in the top corner.
Another idea I just came up with. I handstitched using pearl cotton and a whip stitch up and over 2 small rectangular magnets (3/4" x 1 1/2" maybe) at the top corners of the quilts backing. I have this darling landscape on my refrigerator door!