I hear ya
@Joe Mac . My wife and I really wanted to wallpaper a room in our house, and figured the smallest half bath was the place to do it out of a similar fear! Our downstairs is mostly painted white so it's a nice pop of color and pattern when you walk past in the downstairs hallway.
@nolalady you should go for it! You could always try the peel and stick wallpaper if you want something temporary or want to see what it might look like. There are SO many options nowadays especially on etsy. We went with a pattern we really liked but it had to be properly pasted/glued to the walls.