Wallpaper Engine
I just found it, and wow, this thing is pretty darn cool.
http://store.steampowered.com/app/431960

It's very easy to create and share stuff, here are some of the things people made:
https://youtu.be/pC_3HiZDjwE?t=44s
I use it, though i rarely see my desktop. Some amazing stuff on the workshop.
Fucking OS X. I can't get it
Tho that is very cool that will be resource taxing if that came out for mac or linux I might say I give that a play but windows, nope, no live wallpaper/dreamstream so on systems ever made it useable to have it.

I give it its due it looks epic tho.
https://youtu.be/zgqWuNoIo-Q?t=6s

I don't need it, I don't need it, I don't need it, I don't need it, I don't need it, I don't need it... I need it.
Bought it today. It's great, definitely recommended!

My favorites:
Fate Zero ED animation
The Last Of Us Menu Screen
The Witcher 3 Menu
Ori and the Blind Forest Menu
Oregairu OP & ED
Does anyone know where to find NSFW wallpapers for this software? I can't seem to find any place other than the Steam Workshop.
Afaik, Steam Workshop does not allow NSFW wallpapers.
Same thing was asked on Reddit before. I hope someone makes a share website somewhere, it would be nice.