The lockscreen Backgrounds can be found here: /usr/share/themes/ (alpha for the blue theme and beta for the orange theme) /backgrounds/lockslider.png There six of them: LockSliderBottom.png LockSliderLeft.png LockSliderRight.png LockSliderThumb.png LockSliderThumbPortrait.png LockSliderTop.png just make your own images an rename an copy over !