Personally I have been using this one https://getwallpapers.com/wallpaper/full/e/3/d/1515937-dark-windows-10-wallpaper-2560x1920-windows-10.jpg
Personally I have been using this one https://getwallpapers.com/wallpaper/full/e/3/d/1515937-dark-windows-10-wallpaper-2560x1920-windows-10.jpg
https://github.com/saint-13/Linux_Dynamic_Wallpapers
A random one every day