For weeks now, Blizzard has been offering pre-purchases of the game online, and you could download Diablo 3 in its entirety before release in order to simply click a button and install on launch day, and customers can continue to buy it through them at any time since then.
You can search for specific types of pictures or you can just click on the most popular pictures on the opening page and then just continue clicking on the "more shots like these" button.