How To: Change Desktop To Plain Background (Windows Vista)
1. Right click on a blank space on the desktop. From the menu that appears, left click on 'Personalize'.
2. In the new window that appears, click on 'Desktop Background'.
3. Click on the drop down arrow to the right of 'Location'. From the menu that appears, click on 'Solid Colors'.
4. Click on an appropriate colour, then click on 'OK'.
5. Click on the 'X' in the top right corner of the window to return to the desktop.