Requirements: A jailbroken iPod Touch or iPhone and Wi-Fi Access
and Winterboard installed.____________________________________________________________________________
Tap the Winterboard icon. For a guide to installing Winterboard see
(ADD LINK WHEN TUTORIAL'S DONE)____________________________________________________________________________
Tap the Winterboard icon on your Springboard.
You will then get this screen. Press "Select Themes".
Tick the theme you want by touching it. "Saurik" is the pre-installed theme that comes with it but I've chosen a tap to unlock lockscreen.
Then press "Winterboard" at the top and you'll go back the opening page. This time it will say "Respring" at the top left.
Press "Respring" then wait.
You will then end up back at the lock screen with your changes all applied.