Ah - good choice - this is one of my favourites! I suppose you what to know how to get it on the desktop now. Getting the wallpaper onto your desktop background can be done in a number of ways. You can either right click background wallpaper below and then click 'save target as...' (IE & Opera) or 'save link as...' (Firefox). Please remember where you save it to!Then go to wherever you set the background for you particular computer / operating system and select the image.
Another way is when the full screen wallpaper is shown, 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 have faith in you. You probably already know in fact. I'll keep it shut now.
Return to wallpaper thumbnails.