Changing your desktop wallpaper can help you feel better and more motivated, but using a high-resolution monitor, such as a 4K monitor, may reduce your wallpaper choices. Meanwhile, software ...

and it's the first one Microsoft is charging for (a modest 99 cents). For those with desktop or laptop PCs with 2K or 4K resolutions (or the odd Surface 3000 x 2000) wallpapers in 4K look amazing.