All art on the league of legends webpages looks breathtaking is there a place I can download it?

On all webpages you can see amazing art that riot has made. Ex: On the home page you can see art. Is there any way i can download it? I can just right click and press "Save As". I don't have a preference of formats I just would love to set is as a desktop background or mess around with them on Photoshop.