Beneath this light switch is an equal-sized hole cut in the wall, with cable wires running behind it, intended probably for a sound or alarm system. The homeowners were not using it, and it had a blank wall plate over it.
Instead of having a white plate of plastic that was not serving any purpose visually clog up the wall, I removed the plate and just let the wallpaper cover the opening.
Right now, you can see a little warped area where the paper is spanning the void. But as the paper dries, it should pull taught and disguise the opening nicely. The mottley color of the wallpaper will further help to obscure the area.
The Wallpaper Lady's Blog 
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