I've got mine in a converted First Aid Kit box that I put on the wall. (Look to the left of Spiderman.) It is decorated to match the Space Invaders wall to the left, and has the Command hooks inside it to hold the keys. Each pin has its own matching keychain. I used to leave them in the locks, but my 1 year old niece has learned to walk and is already pushing flashing buttons, so they're up for safety now.

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That's an old pic, because my Stargate keychain isn't on it and the sub isn't hooked up. I liked having the matching keychains showing, but my NGG key likes to rotate and open the coin door while I'm playing just to screw with me. There's also a remote control in the box to turn on the pins in the main room, which was the point of the box to begin with... remote holder. Luckily it easy converted to key holder too.