Ah - good choice - this is one of my favourites! Do you need to know how to put this on your desktop? There are a number of ways to set the chosen wallpaper as your desktop wallpaper / background. You can either right click desktop wallpaper beow and then select 'save target as...' (IE & Opera) or 'save link as...' (Firefox). If this is your chosen route, remember where you save 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.
Instead you could, when the full screen version has loaded up, right click it and select 'save image as...' or 'set as Desktop Background' or 'Set as Background'.You'll know what to do when the time comes. I trust you. You probably already know in fact. I'll keep a lid on it now.
Return to wallpaper thumbnails.