Pick out a desktop wallpaper and follow the instructions for a computer decoration that features your friends from The Backyardigans.
A browser window will open, place your cursor on the image, then hold down the right mouse button, and select "Set as Wallpaper" or "Set as Background." Your wallpaper should now be set to your new selection.
A browser window will open, click and drag the image to your desktop. Open "System Preferences" and select "Desktop." Drag the image into the desktop pictures window. Next, select the image as your desktop. Your wallpaper should now be set to your new selection.