I'm clueless when it comes to interior design. I like the idea of wallpaper in my bedroom, but I'm concerned that it might be too much. It's an average (at a guess) double bedroom but I'm slightly worried that the room is too small to carry off a pattern. Is there a general rule when it comes to room size with wallpaper or is it more to do with colour? The last thing I want to feel is enclosed when I'm in there.