To set different wallpapers on dual monitors in Windows 10, you'll need to go to your "Personalize" menu, which you can open with just a click.

We've done dual-monitor wallpapers before, so if 10 options won't cut it you can find more in our previous posts here and here.

Roy Tanck has released a web service '4K Desktop wallpaper generator ' that can randomly generate 4K resolution wallpapers for free, so I will actually use it to generate wallpapers for 4K monitors.