It's called Lively Wallpaper. For most people, Lively Wallpaper might just be good enough to manage your wallpapers, and you might not need the large repository of options available in Wallpaper ...

It comes with the Lively Wallpaper tool and is free of charge. If you want to switch back to the standard background, select X Active Backgrounds in the menu bar at the top and then click on the X ...