Saving image as a desktop
Click on the image (or link) you would like to download. A new window will open with the full size desktop image appearing in it.
PC: Right click on the image and select 'Set as Background'.
MAC OSX: Click on the resolution link of the desktop you'd like to download. Once you have the desktop image open (a new web page should pop up), Control-Click and select “Set As Desktop Background.” Select “Set Desktop Background” in the preview window that opens.