Its specialty is HD and 4K wallpapers. You can filter the search by keywords , in the upper-right bar. There is also a wide choice of filters by themes accessible from the All Categories tab, where ...

Each of these 4K wallpapers (that's 3840x2160, pixel fans) has been set to a desktop-friendly 16:9 aspect ratio, and with minimal compression so they look super sharp on your monitor.

Today I stumbled upon Microsoft’s 4K rendering of the Windows XP wallpaper Microsoft Design site has a ton of attractive wallpapers, retro and otherwise.