Google Meter is an all-new app, released by Google's very own Creative Lab, that is really quite innovative and could be potentially extremely helpful.
Essentially, what the Google Meter app does is take your boring old, completely static wallpaper and transform it into a fully functional Material Design widget. This widget can display a whole range of things whether it's your battery life, WiFi signal strength, update information or any other kind of pending notifications.
For added convenience, the widget's cycle whenever you turn on the screen to help you avoid getting confused.
The app is completely free and is open sourced on GitHub, meaning the developers can add their own features to an app that's already highly dynamic and useful.