InCall: Personalization is a great app that lets you personalize the caller screen with cool themes. You can change the theme for each contact, so it's great for people who have a lot of contacts. You can also add some fun elements, like an animated photo or an audio message, to make it more personal.

It has a really simple interface and you can easily change the theme for each contact in your phone. It's free and you don't have to pay a penny to use it.

InCall: Personalization is a really simple app and it works on most Android devices.