Over the years, we’ve learned that wallpapers are some of the most popular content on our family of websites. Thus, we’ve created a
central location for Blizzard wallpapers to make it easy to browse through our entire selection. You can access this page via the Games menu on the top left. From the page itself, select one of the links at the bottom to view the wallpapers from each game.
Original post by World of Warcraft Community Site