Get FREE Christmas Wallpapers. Simply click on the wallpaper you would like to set as your desktop background. Once you have selected the wallpaper, chose a size for the wallpaper. After that is very easy, all you have to do is save your free wallpaper to your desktop and set is as a wallpaper on your desktop. I know that sounds kind of silly, but there are some cool wallpapers out there, so make sure you take advantage of this freebie and let us know in the comment section which one you chose.