I would love to see a dnd setting based around Terry Brooks Shannara. Some tweaking would have to be done (Druids are much more similar in capabilities and fluff to Dnd wizards, and such) but I think it would be awesome. High fantasy, with multiple ruins and legends of bygone threats. Built on a post, post apocalyptic setting (the modern world, with a hidden magic vibe). It has a little bit of everything. The Word and Void series are explicity tied in with shannarra, being set in the present day with a "behind the scenes" magical battle between good and evil. And of course, Landover is connected with the modern world via the fairy mists, so you can even have an interesting twist on planar travel.
Wait a sec. Landover is surrounded on all sides by the "fairy mists", and travel through them is dangerous and capricous at best, often requiring magical beings or artifacts. The inhabitants of the mists are inscrutable, meddling in the affairs of mortals for both good and ill. The state of landover is linked to that of it's kings..... the fairy MISTS.... Landover is a friggin' Domain of Dread! The Paladin is a dark lord! Mind=Blown