Oddly enough I often find myself surrounded by darkness even when lucid. I guess I just not that creative when it come to landscapes. I often treat the darkness as my home area in my dreams, for some reason I feel safer in the area where my mind treat as a default then I do anywhere else.

Next time you become lucid try spinning around wishing for a new location. I heard that helps if you want to go somewhere fast. I believe IIRC that it stabilizes your dream in the progress.