A free program for Android, by Smart Mobile Lin.

This application is the best way to change your phone’s lock screen. Photo Keypad Lock Screen will let you experience a brand new way to secure your phone. You don’t need to go through any other applications to make your phone more secure because this application will do everything for you.

 It’s so simple to use you’ll be able to change your phone’s screen lock in just a few minutes. After installing the app, you can select the type of lock screen you want. Next, select the password, pin, or password code you want to use to secure your phone.