A free program for Android, by xLive.
This is an amazing app for your phone that has a lot of beautiful wallpapers, backgrounds, and many more. It is free, easy to use, and you will not need to spend any money to get all of them. The best thing is that it has a lot of different categories, so you will not have to go through the entire app to find what you want.
The wallpapers are high-quality and they will make your phone look great. You will be able to choose between a lot of different themes, so you will not have to worry about what theme you want to use. You can change it every day if you want.