How to change the keypad (enter passcode screen) color of iPhone?

I have figured out what the.png files are I just don't have the slightest clue on how to change them. I know they are "DeviceLockKeypad.png, DeviceLockKeypadPressed.png, and DeviceLockKeypadDelete.png" but I don't know how to change the colors on them. I'm more so looking for a green or lime green. Any KNOWLEDGEABLE help and or guidance would be welcome.

To do that you need a jailbroken apple device and cydia. There are numerous tweaks that change the lockscreen keypad that don't require you to do anything on cydia.

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