This website is a gallery of pictures and paintings taken from the walls of computer games spaces. The number of pictures is still quite small as it is a work in progress. It's interesting to see the types of background images which the artists have placed, often the images are blurry and a pixelated mess due to the nature of 8 and 16 bit restrictions of 16x16 pixel canvas.
The Legend of Zelda: Ocarina of Time features pictures of Poe's
The background mural from Street Fighter 2, taken from E.Honda's level.
The amazing Monkey Island, I love the pixel art quality of this!