If you're after storage that will hang from the wall, I think this looks the business:
http://road.cc/content/review/181325-feedback-sports-velo-hingeAllows you to fit multiple bikes and fold them towards the wall so you can put them close together and still get the bike you want out of the middle. I've not got around to getting them yet though, so can't speak from experience.
And to keep it on topic, I like the suggestion of the guy in the comments to use a 2x4, stick a hook and a bit of gutter onto it and then use hinges to attach the 2x4 to the wall so that the whole assembly can pivot!
I've no idea how I am going to hang my trike, or if I have the wall space to do so, but that's not such a big deal because I'd have to finish it first!!!
Cheers
Duncan