Ah - good choice - this is one of my favourites! I suppose you what to know how to get it on the desktop now. There are more that one way to skin a cat when it comes to setting the wallpaper / bcakground as your desktop. You can either right click the background below and then choose 'save target as...' (IE & Opera) or 'save link as...' (Firefox). If you do this - remember where you saved it! Next goto your computers display control panel and set the background to the image you just saved.
Another way is when the full screen background has loaded, right click it and choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. It'll come to you when the time is right. I've never felt so sure of anything. I bet you already know. I'll button it now.
Return to wallpaper thumbnails.