I personally do not do it but our club president has a piece of plywood made up the attaches right where his wing attaches. He then puts a hook in the plywood right over the CG and hangs in that way from the ceiling. The wings are stored on storage racks made from 3/4 dowel rods glued into the 2X4 wall studs.

Of course this only works on planes with one piece wings. Really simple but very effective