a local garden centre does a weld mesh panel (like square chicken wire) just poke the rosettes through and hang it on the wall. I do gaffa tape the edges to protect the paintwork but after doing a few other things this works well. Its full up now though!
I have mine pinned, sorted by colour on those big cork message boards, and hung up the walls of my stairs - they make lovely solid blocks of colour but many have subtle variations such as gold spots, or lettering on the tails(they go on the bottom row so they can be read) and brighten up the walls beautifully, plus they are safely up and out of the way.
On a cork board in the kitchen, only began competing again in the last three years (new mare does parties, the old one who was with us for over 20 years didn't) Now it's full and I am not sure what to do with them, maybe just get another cork board and end up with the kitchen walls littered with them