AMOLED is a nice app that has large variety of 4k wallpapers and live wallpapers. If you are not satisfied with your system homescreen background, try it. 10000+ wallpapers, all in 4k and HD quality. Live wallpaper: making your homescreen dynamic. 3D wallpaper: set wallpaper in 3D effect. Varieties: Popular/Nature/Winter/Beauty/Cartoon/Car….