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I saw something likewise, but done in white and it was a bit more subtile. I did like it...might even use it as I have a huge wall with nothing on it....
I think it's a cool idea. I've been meaning to frame family photographs for years (you know how they say a plumber's pipes always leak) ....I've got a long passage....and grandchildren that would like the idea. I was thinking one could use a vinyl cut-out as that wouldn't damage the wallpaper.