Here's how I did it....
I got these cute lil' key hangers on clearance at Hobby Lobby.
Then, I nailed in my key hangers. (It would probably be a little bit better to screw them in so that they are held firmly in place. (I did this off the top of my head... so I was just trying to use what I had on hand.)
That's it! You're done! Cute, huh?
I look forward to the day that we buy a house, and I paint every wall in the place because I think this would look so much cuter on a painted wall! (Not that we can't... We have the best landlords ever... I just don't want to have to repaint over everything before we move out someday...)