iPhone TARDIS Lock and Home Screens (iOS5 or 6, iPhone 5)
If you're looking for a version of this lockscreen for iOS7 or later, then head here.
A TARDIS lockscreen for your iPhone: now iPhone 5 compatible and still Thal-unfriendly!
If you're using an iPhone 4S or older, you should head over to this post. (And if you're still on iOS4 then head to the original post.) Otherwise, grab this version: just right-click and 'save as', then transfer to your iPhone using email (or do whatever your inner nerd tells you is necessary). Once again, the colours look odd, but that's to compensate for the lockscreen overlay, and the 'Police Box' text is missing because the time and date go there.
There's also a home screen, which is darker, so that it doesn't interfere with your icons.
Lock screen (iOS5 or 6, iPhone 5)
Home screen (iOS5 or 6, iPhone 5)