Script Download: ChangeWin8StartScreenBackColor(PowerShell).zip
http://gallery.technet.microsoft.com/scriptcenter/Change-the-background-b6807576

This sample shows how to change the background color of a Windows 8 Start screen by using a PowerShell script.

IT administrators can use this script to adjust the background color of the Windows 8 Start screen for a group of computers to keep the user experience consistent.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery