The desktop wallpaper may be one of the most frequently customized items in Windows. You probably want to see a different wallpaper from time to time even if you never change the settings for the mouse, keyboard or sounds. Windows Vista supports common image formats such as JPEG, GIF and PNG. To personalize Windows Vista's background, use your own photos or try downloading free wallpapers from the Internet.
click the "Picture Location" drop-down list to view available pictures in the folder listed. Select the picture you want to use as a Windows Vista wallpaper. If the picture you want to use is not in any of these folders, click "Browse," find the picture on your computer and double-click it to select that picture.
Set the wallpaper's display type. Windows Vista gives you three ways to display a desktop background. Choose the first option on the left to stretch the image to fit your desktop. Pick the second option to tile the wallpaper. Select the option on the right to display your Vista wallpaper in the center without stretching it to fit the screen.
Click "Change background color" to set a solid color for the Windows Vista background. You can use this only if you had selected the option to center your wallpaper but not stretch it. Choose a color that complements the wallpaper well.