Painting the bathroom can be a project that won't have to be redone for up to to ten years. You have great options on color, styles, texture additions, and etc when using paint. Paint can usually be easily changed. You'll want to purchase a style of paint that is specified for a bathroom since it will be exposed to dampness frequently. Most reputable paint manufacturers have a paint line specifically for bathroom for mildew-resistance.
Solid-surface material can give your bathroom a large variety of color and style. This material will likely last a lifetime, but may become quite costly if you have a large bathroom.
Wallpaper will look good for up to seven years before needing to be replaced. Wallpaper comes in a wide selection, but may vary from company to company. Keep in mind that styles of wallpaper do change often, and it is possible that you may not be able to match the wallpaper later.
Another fact about wallpaper is the moisture in the bathroom. Small bathrooms may steam up quicker and more often, so the wallpaper may damage easily.
Ceramic tile lasts a lifetime, but requires much regular maintenance. There can also be a problem with grout when ceramic tile is around dampness. Ceramic tile can look nice, but if you do not want to deal with grout and mildew frequently, you may want to opt for another wall covering.
Mirrors are an added contemporary look that can give the illusion of enlarging the space in your bathroom. They are nice to allow full head to toe views, but over time they can lose their luster and may fall apart. You may want to consider installations that will allow you to replace the mirrors after several years.