Welcome to the board from Southern California!!!
I have seen a couple of products that use magnets.
http://www.magnificentquilt.com
This one is called Magnet-Ficent Invisible Quilt Hanger.
I have not used mine yet but my very good friend has a pretty good sized quilt hanging on her wall with one of these. It uses those 3M reuseable strips to attache the magnet to the wall