Call Theme is a handy application that allows you to make your phone call screen more entertaining and unique. This app lets you change the background image and themes. You can even add a specific theme for each contact so that you can easilu identify who's calling you.

When you first open the app, you will see a small menu on the top-right side of the screen. You can change the background image and themes by clicking on the menu. After you make your changes, you will need to restart the app for the changes to take effect.