Rainer Roesing of coresinceeightyfour.com found this non-working, round three-plug socket at a flea market. Since Roesing is from Berlin, this one looks like a German outlet; but we American viewers think it lends an extra layer of cool onto an already cool project.
After fastening the outlet to the wall, Roseing made keychains for his keys from the plugs. At the end of the day, when he's ready to hang up his keys for the night, he can plug in his keychain to keep the keys at easy reach.
It's a cool project that would be easy and inexpensive to tackle yourself. We found a few different listings for some vintage plugs and sockets on eBay, but you might strike gold at your local hardware store (for new, industrial-style pieces) or flea market (for vintage and international finds).