So I had this thought this AM while working on a different project. Why not make a dungeon-specific terrain set?
It came out better than I expected
It's not approved yet, but when it is you'll have access to this:
It's a little tricky making it look exactly right due to the way terrain gets stretched but the overall effect is what I wanted. I was going for something that was useable for third person over the shoulder and top down games. Mission accomplished. doesn't look too bad in FPS mode either: