I love the idea. I would never have thought about framing a piece of wallpaper. That’s a unique idea. So often, you see the same art from house to house. I like being original, and this fits that bill!
I love the way you’ve used the plates on your wall! I have an Aunt who has about 25 all tucked away in boxes. I am going to share your idea with her. (You can’t enjoy the things we buy, if they are buried or hidden!).