Free Christmas-themed desktop wallpapers are available on WallpapersWide.com and DesktopNexus.com. To download Christmas-themed wallpapers from WallpapersWide.com, navigate to the website, click the Holidays category on the left sidebar, and click Christmas under Holidays. Click an image, and click the Download button to download the wallpaper.
To download Christmas-themed wallpapers from DesktopNexus.com, navigate to the website, and enter "Christmas" in the search text box at the top of the page. Click an image in the search results, and click the Download Now button to display an image size optimized for the current screen. Right-click the image and select Save Image As to download it. Alternatively, right-click the image, and select Set as Desktop Background to use it as the background of the computer.