A free program for Android, by Blue Horizon Apps.

NiceLock is an unofficial, open-source application for users of the Good Lock app to customize their phones with new themes and layouts. It is based on Android Architecture and has been optimized to run on Samsung Galaxy devices.

It is a very simple and intuitive application, and the UI is easy to understand. This tool also allows you to change the layout.

This is available on Google Play Store for free. All you need to do is download and install this application on your phone or tablet.