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cover your wall with magnet material. Comes in rolls 24"-39". coat it with adhesive and cover wall. you can then cover that with wall paper, if you like. Or you can place smaller patches of magnet say 16x20 and change up images as you like.
Now the print part, take any type of print, inkjet or c-print and mount it to magnetic receptor paper. this is a thin paper with a metal backing, also flexible. doesn't add any real thickness to the print. Or depending who does your printing you can print direct to the receptor paper. The paper come in rolls up to 60"wide.
this has become a very common way of doing displays in the retail world. they change out graphics every month, so its easy for store employees to change and no need to bring in an installer.
In the studio we have a metal wall, made of sheet metal and painted. we use this to view prints on. Just hold them to the wall with magnets. Just like a refrigerator.
hope this helps