If you are looking for a Mario Odyssey wallpaper to use as your desktop background, there are several different types of them available. One of the most popular is the calendar wallpaper, which is a stylized game render of Mario with Cappy. It also comes in a non-calendar version. You can download all of them from the links below. If you want to make your own, please visit the following link: http://supermarioodysseywallpaper.org/#/wallpaper.