MySnowAngels.com Background Images Instructions if you are running Windows: Click on a background to the left and the full size image will open in another window. When the image is completely downloaded, right-click on it and select "set as wallpaper." Instructions if you are on a Macintosh: Click on a background to the left and the full size image will open in another window. When the image is completely downloaded, Control-click on it and select "Download image to disk." Save the image and use the Appearance control panel to select it as your desktop pattern.