They were terrible and tech isn't good enough and still isn't., and who's going to pay the hundreds it would be for a decent one, then you still have a power cable, snaking up the wall.
Good idea but far to expensive for something worth it and some downsides.
It doesn't have to be pictures of family. You could download anything of the net. Any art.
A 20"+ 4k e-ink display, that was very thin would be cool. But they don't exist yet and would be very expensive. But would get rid of that annoying bright glow and generally look better. Less power and heat as well. I would like one like that, download art from deviant art or similar and have it on the wall, get bored just change it.