Windows 8 is no doubt very impressive, faster and optimised for perfect user experience then ever, the most noticeable and liked thing about windows 8 is the start screen which shows various useful apps on welcome once you are logged in to windows 8.
But most of the users who have started testing windows 8 developer preview on their systems, feels bored with the same background color and moreover there is no option in windows 8 to change the background color or wallpaper behind the metro start screen in windows 8.
Recently a new tool named Windows 8 Start Tweaker has been released which now allows you to change the metro screen background wallpaper or color as per your wish as shown in the image below.
With this tool you can make any image file (png/bmp/jpg/gif) as your default screen background, and you can also change the background color of your Start screen or logon screen. IT works for Windows 8 WDP (build 8102) only, you can drag the image file onto the form, it really works.
If you want the image fills out the whole screen, you should make a image by yourself. The Height of the image should be doubled with the Height of your Screen Resolution. For example, if your Screen Resolution is 1280*800, you should make a image with Height 1600, and the width is not limited. Windows 8 Start Tweaker v1.01 is written by C++ WTL, and it is only 103kb, a portable utility. IT works for Windows 8 Developer Preview only, refer this developer page more info and updates.