How do you get the Call of Duty: 4 prestige icons as gamer pictures on Xbox Live?

I can not figure out where on the marketplace to buy these icons for gamer pictures or do you have to acquire them a different means.|||Go to marketplace %26gt; themes and gamerpics %26gt; sort by game %26gt; COD4 . their in there.|||You can't download them in anyway as gamer pictures.