Do you like them? (obviously you do) Options include those coffee tables built with a glass area and put them on display there, I like shadowboxes for collectables, you can mix that in with pictures of events associated with the pins .... or not.

We had a thread here somewhere of "what do ya do with all those century patches and numbers?" Oh, hear it is:

http://forums.teamestrogen.com/showthread.php?t=6824

One project on my back burner is make a cork bulletin board out of my wine bottle cork collection and put the patches there.