Just be aware that the moisture may cause the paper to peel or bubble. Get it on securely, and make sure the room is well ventilated. You can make a huge impact in the room by getting rid of dark wood and old hardware on cupboards. Use paint and replace the knobs. There are many painting techniques, but shiny white always looks great.
Live plants thrive in a bathroom that has light.
They are always a good decorating choice. Use scented candles and potpourri to make your bathroom pleasant. Dried flowers work well also. I have some dried Eucalyptus leaves tied up with a ribbon. They are very fragrant.