I could probably write one myself if you really wanted. ;)
But seriously, I've been thinking a lot lately about the concept art Moebius did for Willow, which really shows a significantly different film than the one we ended up getting. In any case the film would still have owed a lot to Tolkien and CS Lewis, but we might have had something much more visually interesting.
Heck, I could start a whole thread about Willow and SW and how they interrelate, if anyone's interested. It would probably need to be rather image-heavy to illustrate the early Moebius ideas, though.