One of the fun features of Windows Phone 8.1 is the ability to add a background image to your Start Screen and let it shine through transparent Live Tiles.
There is a new Windows Phone 8.1 app in the Windows Phone Store that lets you take this customization one step further. Start Screen Customizer provides you with the ability to choose a solid colored background or adjust the tones of a background image to give your Start Screen a little more pop.
Full story from the WPCentral blog...