There are plenty of ways to make shelves more exciting than flat, mono-coloured boards suspended from your walls. Even so, if you're looking for an idea that's a little more original, this "book" shelf is hard to go past.
Instructables user "ctx1985" threw his shelf together using a copy of Jack London's "The Call of the Wild", but any decently-thick hardcover title will do the trick. Make sure you're armed with a screwdriver, awl and/or a drill, if you can manage it. You'll also need some hooks, screws, picture hangers and string, with more details on these available on the project page.
Once completed, it should be strong enough to hold your pocket debris — coins, mobile phones, keys and the like — though depending on the size and strength of the book, you might be able to go meta and put actual books on there too. There's nothing stopping you from placing several side-by-side either to create larger shelves.
Make a "book" shelf [Instructables]