Are you currently looking at a bland desktop? Is your wallpaper uninspiring? Do your eyes crave something other than the default desktop wallpaper?
If you have a computer capable of displaying wallpaper you owe it to your pixels to check out https://www.peppercarrot.com/en/static6/sources&page=wallpapers
@davidrevoy has some amazing artwork up there that is just waiting to grace your desktop / background.
Only you can prevent bland desktops.