Does anyone have a big copy of the mural from the inside of the cd case, and the thing from the save game screen showing progress? That would make a solid squeeky desktop background.
You might be able to lift it with SCUMM REVISITED but I don't remember if I ever found it while I was bumbling around in there. Tell me when you get this done I might want it
If you're looking for a bigger copy than what's in the game itself you're probably out of luck; as far as I'm aware, that particular piece of source art was never released standalone, and it's far too late to get it from LucasArts I imagine! :)
As Thrik says, I doubt you'll be able to find a larger version that in the game. However, here's the full size ingame version extracted with SCUMMRevisited:
http://dod.dotagame.com/image.php?image=media/media/mural.jpg)