I've stumbled across a website called The Video Game Gallery (http://www.thevideogamegallery.com
) which features the official art from LucasArt's Fate of Atlantis, Infernal Machine and Emperor's Tomb.
The images are superb quality and huge in size! For example, the Infernal Machine cover art measures a grand 6299 x 4724 pixels and the Fate of Atlantis poster is an enormous 10274 x 7065 pixels. These images are more than adequate if you ever wanted poster-size reproductions.
Here are the links:
Fate of Atlantis