Wallpapering just the back of a niche or bookcase is a wonderful way to get maximum impact for little money.
One of the first things the homeowner said when I arrived for work was how expensive this silver cork wallcovering was. The good thing is that we only need one double roll. That provided enough to paper the backs of both niches. One had a barely-noticeable seam down the middle, and the other, which was less than 36″ wide (the width of the material), was seamless.
The homeowners loved it, and are now happily searching for something to put in the niches. I think something three-dimensional would look best … an architectural piece, a statue, some old rusty object, etc.
The pattern is Thibaut #839-T-7047