If you're not happy with the background of your system's home screen, give AMOLED a try. It features a fantastic selection of 4K wallpapers and live wallpapers.

Here are the following features of the app:

It has more than ten thousand wallpapers, all in 4K and HD quality.
Live wallpaper adds a dynamic element to your home screen.
Set the wallpaper to have a 3D effect.
Varieties: Popular/Nature/Winter/Beauty/Cartoon/Car/Etc.
Phone Translucent: Background with a transparent effect, making your phone look cool.
Wallpaper Auto Change: automatically alters the background of your phone.
Call Flash: Use our themes to personalize your caller screen.