There are many Windows 8 applications in the Windows 8 store and many are regularly added in different categories. There are paid and free applications. Today I found an application called LockPic – a free application that allows you to change your Windows 8 Lock Screen image quickly and easily. Lock Screen is the screen that displays various notifications when the computer is locked with a beautiful background image.
By default, Windows 8 has some lock screens and you can change the lock screen in Start > Charm Bar > Settings > PC Settings > Customize you have the Lock Screen option. This LockPic application offers tons of free images for the LockScreen