Whenever I resume my Nexus 7 from standby, the Android lock screen will be showing. I notice that my home wallpaper just appears to be your lock screen image as well. Now I am looking for a way to change my lock screen wallpaper without rooting. I figured out how to do that on my Droid running Android 2.3. But it seems to be difficulty to customize the lock screen on Jelly Bean with fully personalized experience.
The Android lock screen is integrated with the framework, unlike boot animation and the splash screen. WidgetLocker Lockscreen (TeslaCoil Software) is a lock screen replacement which allows you to change and revamp the lock screen beyond recognition and get control of the layout. With the app, you also change the look of the sliders, customize Slider Actions and hide the status bar. However, it is paid app at US$2.99, not free.