If you have a new Android smartphone, then you would like to set this up once. This may include the choice of a suitable background or a theme in which symbols etc. are integrated. If this is all too complicated, you can also simply ask the Android style guide:
This is an Android site, which categorizes you by asking questions or showing photos. This means that you always have to choose between two pictures.
An example: What do you like better: round or angular
Depending on the decisions you make, a theme package will be presented for you at the end, which can then also be downloaded. The Android Style guide is a very nice gimmick.
Have fun with your Android Smartphone.