Paper that you stick to the walls of a room decorated. a picture, pattern, or design that you choose to display as a background on your computer screen wallpaper can be completely transformative in any room. it has the power to change the look and sense of a room by adding pattern, color, and texture to walls in a way that makeup simply can not do. do not feel confined by the size of the room, either, as wallpaper ideas aren't just for large open-plan species.