Apple Configurator lets you select and set the lockscreen for your iOS devices, as well as displaying either device/username or some custom text. If you’re using the ability for Configurator to assign devices to users, then you can also show an image of the user.
To configure the lockscreen image and the message you would like to display you’ll need to open the Preferences of Apple Configurator, and then click the Lock Screen icon;
Again, this can only be forced if the device is in Supervision mode. To set the image for the lockscreen, drag an image onto the preview of the iPhone/iPad.