wallpaper

Concise Oxford English Dictionary © 2008 Oxford University Press:
wallpaper/ˈwɔːlpeɪpə(r)/

▶noun

• 1 paper pasted in strips over the walls of a room to provide a decorative or textured surface.

• 2 something, especially music, providing a bland or unvaried background.

• 3 Computing an optional background pattern or picture on a screen.

▶verb apply wallpaper to (a wall or room).