I dont know if it is already common Knowledge but for everybody who dont know about that:
If you have Steam and 4 euro to spare, i highly recommend you check out the Software called “Wallpaperengine”.
It will Change your Desktop Background to all sorts of Animated Background Wallpapers created by the users using Steam Workshop ( so you dont Need to pay for it )
It is realy popular among the Anime Community ( like 50% of all the Stuff has this tag ) and there are ofc KEY Wallpapers as well.
You can make your own wallpapers as well, if you know Programming, or 3D animating ect. you can even make interaktive Wallpapers.
I give you some advise:
look at the filesize of the wallpaper you want to use, some People upload full Openings unpacked, that wont look good and it takes 500mb of your disk. I prefer Little short animations, in the best case you wont even notice that it is in a Loop.
Dont worry about your Performance , if you take my advice from above it will stress your PC with like 10-50mb RAM and 0.2% CPU, it is highly optimised ( stops if you have something other in full Screen open ) and works fine even on my 7 years old Laptop ( not even a GPU here ) or with several Monitors ( if you are one of the lucky People who have 2 or 3 )
Sry i dont want to do Advertising here ( i have nothing to do with the developers )
didnt found it on the Forum and i myself would have been happy if somebody told me earlyer as i cant imagine going back to the “normal” Wallpapers after i installed it 6 Month ago
( jeah it it that kind of Product, you dont think you Need it untill you have it )
If you make some awsome Wallpapers for Key Anime, it would be nice if you could share the link here.