Decorating a bedroom wall

The Glamorous Librarian wanted ideas for decorating a wall in her bedroom, so I thought I'd give some examples here. I decorated my livingroom wall with a giant sticker over a year ago and am quite happy with the result. What's great about these vinyl stickers is that you can take it down when you're bored of it, and it won't leave a mark (they claim - mine's still up)! Just remember to be thorough when you put it up so that all the little parts stay in place. Some of the small parts (like the grass) at the bottom of my design have started letting go. But the small bits higher up are still ok so I guess I was a bit sloppy at first. All the designs below are from http://www.veggpynt.no/:

This is what's decorating the wall above my couch (to the right hand side to make a more interesting space):

For a bedroom a simpler design might be the way to go:

Or maybe something funny?:

I like these two guys:

Or maybe filling the whole space with wall posters? Like a wall paper, but then not:

Being a librarian, why not sleep next to books that won't fall off their shelves?