Here’s an interesting jailbreak tweak. Control Unlocker
by iOS developer Stevie Hetelekides gives you a virtual old-school game controller on the lock screen that you can use to unlock your iOS device.
Shown above, the virtual game controller gives you an A and a B button, as well as a thumb pad that gives you Left, Right, Up, and Down controls.
After installing the tweak, your default unlock pattern will be to press A, B, A, B in that order. After doing so, your device will unlock. You can then head over to the Settings application to customize the tweak some more:
From the preferences pane, you will be able to enable or disable the tweak on demand, as well as choose a sequence for unlocking your iOS device, and choosing a custom text string that you want to appear on the controller.
To set a new sequence for unlocking your iOS device, just tap on the Clear Sequence button to clear the existing sequence, and then start pressing buttons on the controller to set a new sequence. Be sure to use a sequence that you will remember.
If you would like to give Control Unlocker a spin, it's available in Cydia's BigBoss repository for free. The tweak has only been tested on iOS 6 iPhones and iPod touches.
iPhone or iPod touch running iOS 6.0+