@Albinolan I had the same idea a few months ago and I’m still thinking about realizing this. There is, after all a module here that can show pictures in the background. There is also one guy using MM without a mirror on his fridge.
Lots of cool ideas
Regarding this: The smart mirror idea has been getting some push in recent months/years and some people try to make money out of it. There’s a lot open source to build upon I guess.