However, you cannot set an image on one desktop and solid color or slideshow on ... where you set the desktop wallpaper. Now, you can find some wallpapers on your screen. Right-click on one ...

which lets you turn your iPhone lock screen into a slideshow of your coolest photos. Photo Shuffle will scan your library for wallpaper-worthy shots, sometimes throw on some sharp edits ...

or a slideshow. This will replace the black background with something else. All the desktop wallpapers are saved into C:\Windows\Web. The wallpapers are categorized into 4K, Screen, touch keyboard ...