Refresh a bath or shower surround
This can be done by removing the grungy silicone around the perimeter of the tub or shower base and re-caulking with fresh silicone. If you have a tile surround that is in good shape but just an unattractive colour you can paint the tiles a neutral colour to brighten the surround. You can also use various acrylic panels to cover up existing tiles. Sometimes just adding a fresh looking new shower curtain can be enough to draw attention away from a less attractive surround.