I have three and am still waiting for two more to come by mail; the shops were out when I got there.
I plan on using all of mine together in a tote bag - I need to make a big one to carry my cutting mat in when I go to classes and I am going to slap my plates onto that sort of like old travel stickers on steamer trunks. (I'll fuse/applique them down, probably) Not particularly inventive, but that way they'll get used and seen often!