I have been hanging lots of my little quilts with the removable 3M Picture Hanging Strips and a piece of hook and loop tape as explained in my How to Hang Small Quilts - Idea 1 blog post.
I also did a lot of
searches for some type of metal and magnet system. I found these metal
organizer strips by Three by Three to mount on the wall with a couple of screw. I also bought round rare
earth magnets which are extremely powerful and these are actually
decorative. I gave it a try and I'm so happy with this option!
It is easy to switch out quilts
and even hang some larger quilts. I'm not sure how much weight they will
hold yet, but I use it mostly for the small quilts anyway. 
Thanks for reading!
I make lots of small quilts and art quilts and I wanted to figure out a way to easily hang them and change them out without making lots of holes on the walls. Well this works great and all you need is hook and loop tape and two small 3M Picture Hanging Strips.
I hand sew about an inch piece of the loop side of hook and loop tape (it's the fluffier side) on each upper corner back of the quilt.
Then I press the Picture Hanging Strip on the loop with the pull down strip facing down.
Then peel off the liner, line up on your wall where you want to place it and press on each corner for about 30 seconds. Voila! You can remove these strips anytime and swap out your little quilts.Here are some of them:
Also see my posting on How to Hang Small Quilts Idea 2.