This site provides eXtra eXtra Large (XXL) desktop wallpapers, especially targeted for multi-monitor setups.
Each wallpaper is available in 37 different sizes, from classic 1024×768 up to 3840×2400, and as well multi-monitor sizes like 6x1280x1024 (7680×1024) or even 5×2 heads like 5x2x1280x1024 (6400×2048).

We will add new wallpapers regularly once a month or so, check back once in a while.