I actually made this first thing this morning - I had meant to make it yesterday but as I mentioned, I was pooped. I used all the findings from Smitten Beads that I got a week or two ago, and it literally took me a few minutes! All I needed to do was to make two jump rings from some wire I had, cut the chain to length, then use one ring to close the chain into a loop (making it a necklace) and then use the other ring to attach the key to the chain. I really like it although I may attach a bead to it so its not just the key on its own.
It's also meant I've been singing this song all day too!