Wallpaper and Canvas Pictures
Canvas Dezign posted a really good article recently about canvas pictures and wallpaper. The basic idea is that you combine the two printed mediums to give an on the wall, off the wall feel.
On the one hand you have wallpaper, pasted to the wall and flat. On the other you have the canvas pictures that follows the pattern of the wallpaper. In many cases the canvas pictures change colour to give an extraordinary effect.
See the canvas pictures website, Canvas dezign for details