Android users with ICS and Jelly Bean can type and write some text to display on the lock screen. To customize or add owner info to lock screen on nexus 4 do as follows:
1. Open "Settings" app
2. Go to "Security"
3. Tap "Owner Info"
4. Type the text and mark "Show owner info on lock screen"
Update: If you have already updated to Marshmallow, look for the Lock Screen Message option, instead of the Owner Info.