It's one of those things that makes you wonder why no one did it before, but Microsoft has just released an Android app called Picturesque Lock Screen that acts as a dynamic slideshow for your phone's lock screen. You may be wondering why Microsoft is developing Android apps when it has its own mobile operating system to worry about, but new CEO Satya Nedella has made a point of adapting and promoting a cross-platform philosophy. Picturesque is another in a growing line of cross-platform apps recently released from the company's Microsoft Garage team that has so far released the Outlook email app for the iPhone, Journeys & Notes for Android, and the Next Lock Screen for Android.