Because the bathroom gets so steamy, it isn't the greatest place to have wallpaper or even any framed bits of paper or artwork. So if painting the walls isn't your thing, try hanging a large scale piece of stretched canvas to add some visual interest to a small space.
We've mentioned adding color through the choice of shower curtains
and here's another idea. We've been big fans of Textile Arts Marimekko Wall hangings
for a long time and recently we ran across Modern Digital Canvas
who specialize in printed canvas that come in a variety of sizes. We like the graphic styles best. A couple of our favorites, though we don't know how much we can commit to orange...