Android lets you make your device quite beautiful with just a few modifications. A good old wallpaper is still very important, as it can remind you of your family, friends, favorite band, or simply look good. Unfortunately, most ROMs available on XDA don’t offer a function to use a separate wallpaper for your lock screen.
As Android is open source, this inconvenience can be easily bypassed with the Xposed Framework. XDA Senior Member ctbear took a couple features previously seen in GravityBox and the AOSPAL ROM and made them into an Xposed module that allows users to set a transparent lock screen wallpaper on AOSP-derived ROMs. Currently, this module allows you to set a solid color background, a custom image from your gallery, or a semi-transparent image like there is possible to set lockscreen background with solid color, custom image from the gallery, or the semi-transparent mode from AOSPAL.
There are still few issues left like a broken transparent wallpaper in landscape mode, but this is an initial release, so hopefully all bugs will be solved in the future. This module should work on KitKat ROMs. To use it, ensure that you have a rooted device and Xposed Framework installed.
If you are bored with your current lockscreen wallpaper, head over to the module thread and give it a shot. Don’t forget to leave your feedback in the thread.