KnobColoring is a modification for the lock screen of our iPhones that allows us to change andl color of the unlock slider.
The difference of KnobColoring with other similar modifications that we have seen before like ColoredKnob is that KnobColoring allows us to choose the color in a RGB scale, so we can practically choose the color we want, although the colors are very light, almost in pastel shades.
You can download it free on Cydia, You will find it in the BigBoss repo. You need to have done the jailbreak on your device.
More information - ColoredKnob: color the unlock slider (Cydia)