Changing wallpaper on xubuntu is very easy, you can use the graphical interface to change wallpaper on xubuntu, you can also use your own wallpaper instead of choosing wallpapers that comes with xubuntu.
To change wallpaper on xubuntu, simply do a right click with your mouse while on xubuntu desktop, and then select Desktop Settings... From desktop settings you change the wallpaper, xubuntu comes with several wallpapers that you can choose, but you can also use your own photo as wallpaper.
Another way to open desktop settings is from xubuntu start menu > Settings > Desktop. There is an option to change wallpaper every few minutes, hours or seconds (if you have multiple photos on a folder).
