This contest sounds cool - http://events.game-artist.net/scene_from_a_movie/index.php?utm_source=gameartist&utm_medium=900px&utm_term=hero_image&utm_content=street_scene&utm_campaign=ga_event
But,then I noticed in the rules - No Procedurals. No TG2, in other words. Blimey.
Well it's real time only. TG is a renderer so it wouldn't fit that category.
Well, then. You could use TG2 to create the backgrounds...like a movie...
Yes, I suppose you could use terragen to create pieces of a scene for engines that use grayscale heightfields for terrain and skyboxes.