Change Lockscreen Wallp for CM for Android
With this app, that is compatible with cyanogenMod based ROMs, you can set the lockscreen wallpaper.
To set a specific wallpaper, just open your gallery app, select the image that you want to set as wallpaper then click the share button and select this application.
If you want to automatically change the wallpaper using the images in a folder, simply select the folder pathname and the update interval.
In any case remember that for best results you must first crop the images to your smartphone screen size.
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On CM11 latest 2015 build on S4 MINI. Thank you, now I can use black wallpapers just for the lock screen.
by Q####:
I used the same jpg on another app and it replaced the wallpaper, without reboot or anything. CM13 bliss rom.