You can zoom in on any image (hover over the image and then click the “zoom” button that appears over it) and then download it to be your Windows desktop image.  If you visit the site using Internet Explorer, you can also zoom in on the image, then right click on the image and choose the “Set as Background” context menu item to enable it as your Windows desktop.

Note: you want to make sure you download the zoomed-in/high resolution version of the wallpaper to make sure it looks good as the wallpaper on your desktop.

Hope this helps,

Scott