Instructions
Select the "Games Marketplace" tab on your Xbox 360 main menu.
Select "Explore New Games."
Select "Titles A-Z" followed by "A."
Select "Assassin's Creed II."
Select "Extras" followed by "See All Extras."
Select the theme you wish to purchase from the four on screen: the Ezio Premium Theme, the Florence Theme, the Launch Premium Theme or the "Assassin's Creed II" Premium Theme 1.
Select "Download Now" to purchase the theme. Each theme costs 240 Microsoft points. Once downloaded, the theme is automatically installed to your Xbox 360 console.