Take a look on ebay, there's a million different styles of wall hangers. Personally, I leave my guitars in their cases, and just a standard 3-point stand for resting them during sessions.
I've been seeing those around for some time, actually. I've actually seen them used by music stores to hang the guitars they're selling, so they presumably work alright.
I only buy cheap guitars, so they're usually propped haphazardly against something.