eyes

You would be surprised what can be hung on the wall with strong straight pins.

Marcia_PA

What about covering a piece of foam insulation with fabric and just leaning it against the wall. The quilts could be pinned to the insulation.

Some people make use of used sewing machine needles pushed into the wall for hanging small quilts or light art work.

KalamaQuilts

Paint a pretty strip of moulding, nail it up with brads.

then...ta da...scratch around antique/collectable stores/ebay for some of the old wooden trouser hangers, turn the hook to the back and hang on the moulding, the hangers can be as interesting as the quilts.

you can still buy them new, but the vintage ones are more interesting. I paid about 2 bucks each for mine.

JulieR

If you have crown moulding then you could hang ribbons or string from that and affix the quilts to those.

I have covered foam core board with fabric before, and that was light enough for even a dodgy adhesive to hold it up.

Depending on the size though I might go for a three-paneled room divider. It would be free-standing, tall, and you wouldn't have to damage the plaster on the walls. (I've lived with plaster. If I ever have to do it again I'm going to go to a trade school or something to learn how to fix it after I do stuff to it.)