Change Background Color Of Windows 8. You can either change only the background image, background color or both. providing simple options to change the Windows 8 Metro UI.
Don’t want to add an image to the Metro Start Screen?, then click Don’t use background image option.Very easy to use. If you select a start screen image, make sure that it is PNG format, and the height of the image is double the height of screen resolution to fill the entire screen. After you have selected desired options, click Patch. This will ask you to log off your computer, the the changes will take effect.
Below is a screenshot of the changes applied to the Metro UI, using Windows 8 Start Screen Editor
Note: Backup before performing this task, so that you can revert the changes (if required).