LEGO.com: Vikings

PC: Select an appropriate resolution for your display to view a full-size image of the wallpaper you want.
Right click the mouse, then choose "Set as Wallpaper" from the browser pop up menu.

MAC: Click on appropriate resolution. When image opens, control-click it (or right-click with mouse) and select "Download Image To Disk". Then go to the desktop, control-click the background and select "Change Desktop Background...". Browse to the wallpaper file (usually on the desktop) and select it.