I found this site a few months back and was absolutely impressed. I hope to one day have a 4k tv mounted to a wall and framed in my house with slide shows from a custom curated set of art playing on repeat.
I am building this exact thing, called ArtsMuse (http://artsmuse.io). It's early days yet: signing artists and getting a beta-ready system built. I have the same vision as you: using the screens in my house to show art instead of being a big black hole on the wall.
