Possibly one of the most intersting ones on the site. Yawn! I suppose you what to know how to get it on the desktop now. Setting the background as your desktop wallpaper can be done in a number of ways. One way is to right click the wallpaper below and then select 'save target as...' (IE & Opera) or 'save link as...' (Firefox). If you do this - don't forget where you saved it! Now go to wherever it is you normally set your desktop backgrounds for your computer and selected the saved wallpaper.
A different way altogether is to right click the background below, from here choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. You'll know what to do when the time comes. I believe in you. In fact you probably already know. I'll zip it for now.
Return to wallpaper thumbnails.