Wallpaper was a decorative covering which could be applied to the interior walls of a building.
Rory Williams observed that the Apalapucians had holographic wallpaper. (TV: The Girl Who Waited)
By 2008, woodchip wallpaper was out of fashion on Earth. (PROSE: Mrs Acres)
Whilst watching Homes Under the Hammer, Roy bemoaned a choice of wallpaper. (AUDIO: The Torchwood Archive)