Take a look at your Android phone. See that background shot? It's probably kind of cute, but hardly inspiring. In fact, is is bringing you any joy whatsoever? Is it helping you to make rent? Believe it or not, there's now an app for that. Locket has just launched into the Google Play Store, enabling a limited (for now) selection of advertisers to place ads on your lock screen and then paying you one cent for each time you unlock. Of course, it's capped at $0.03 per hour (so every ot
