Careful with this one - can be slippery when wet. I suppose you what to know how to get it on the desktop now. There are a few ways to get the wallpaper to be your desktop 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! 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 has loaded, right click it and choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. You'll have a flash of inspiration when the time comes. I believe in you. You probably already know in fact. I'll keep it shut now.
Return to wallpaper thumbnails.