To download a desktop wallpaper or Facebook timeline cover photo:
Click on the resolution that best fits your screen.
When the image opens, "right-click" (if you are using a PC) on the image and "set as background."
You can also save the image and add it as wallpaper later.
To download a wallpaper for your iPhone, iPad, or mobile device:
Access this page from your mobile device, click on your desired link, and download or save the image.
Alternatively, you can save image to your computer, e-mail it to your mobile device, and add it as your wallpaper from there.