Any ideas to unlock?

[lalamaus.livejournal.com]

Two years ago, when my grandfather passed, I was given the opportunity to voice what I would like to "inherit" from my grandparents' home. I chose my grandmother's key collection. The keys were collected over the years of their marriage and one in particular holds sentimental value to me. It is the key from the hotel in which they stayed in Munich, Germany when they went overseas to attend my parents' wedding. It is an amazing key, too. (Before the days of key cards ruined it all). I have kept all of these keys of various sizes simply arranged on my mantle, for lack of anything better to do with them. I would rather not use them individually, but find a way to display them together, and preferably, creatively. Any ideas?

here are some (rather poor) pictures of them:



Also, any advice on how to care for them? I can already tell that some of the keys have suffered a bit of discoloration due to exposure to elements.

Btw, my grandmother displayed these keys on a piece of furniture in their foyer by simply arranging them randomly, so I can't really steal her idea bc it's kinda lame.