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 a number of ways to set the chosen wallpaper as your desktop wallpaper / background. 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 where you set the desktop background for your particular computers operating system and select the image from the location where you saved it.
Another way is, when the full screen image has loaded, right click it and choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. You'll know what to do when the time comes. I think you have it in you. I bet you've figured it out already. I'll zip it for now.
Return to wallpaper thumbnails.