for blured efect visit here orginal post by pineaple Owl Thanks to him for the tutorial
1- Decompile framework-res.apk with Apktool
2- Open res/drawable-ldpi
3- Delete zzzzzzzz_default_lockscreenw .jpg
4- Copy zzzzzzzz_default_lockscreenw.png
from here to res/drawable-ldpi (or mdpi/hdpi on other devices)
5- Open res/layout/zzz_keyguard_screen_lockscreenwallpaper.xml in notepad++
6- Change android:background="#ff000000" to ="#00000000"
7- Recompile the folder
8- Delete the compiled apk
10- Unzip the original unmoddifed framework-res.apk
11- Copy META-INF and AndroidManifest.xml and paste them to YourDecompiledFolder/build/apk
12- Recompile the folder again
13- Put in a Flashable Zip and Flash in CWM with system mounted