Connecting threads also sells a system where you use very strong magnets that you attach to the wall using Command Strips. Then you put a flat metal curtain rod in your sleeve pocket. It works like a charm. They're pricey, but I use them all the time and they hold the quilts really well. You could use them with a rod in the top and bottom to get it hanging really flat if you wanted to.
What I like about them is that they're completely invisible and so is the rod, all you see is the quilt on the wall. They're easy to put up and easy to remove. It's also really easy to switch out your quilts. For large quilts I put three or four on the wall, using a level between them to make sure I've got them level. It only takes a couple of minutes.
They're made by Magnificent Quilts.com.
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