How do I stop my iPad's passcode buttons from lighting up?
The image you're looking for is /System/Library/CoreServices/SpringBoard.app/DeviceLockKeypadPressed~ipad.png  Using iFile (or SSH), make a copy of DeviceLockKeypad~ipad.png into the same folder. Delete DeviceLockKeypadPressed~ipad.png, and rename your copied file to this. You could also edit the image to be a color other than blue.