Try Face Unlock - Google Nexus 4 Manual Book

A list of widgets appears. Apps that sup-
port lock screen widgets can add their
own widgets to this list.
3. Touch the widget you want to add.
You can add up to five widgets to your lock
screen. To move between them, swipe be-
tween screens.
Reorder lock screen widgets
1. Touch & hold a widget.
2. Drag the widget and release it in the loca-
tion of your choice.
Remove a lock screen widget
Touch & hold the widget, then drag it onto the
Remove icon.

Try Face Unlock

You can set an automatic screen lock for
your phone. If a lock is set, the screen locks
EXPLORE YOUR PHONE 36