Asteroid Field

 I just had to make an Earth with the sun and an asteroid field. I mean..wouldn't you? The camera fly is completely scripted. The asteroids are randomly placed.
Earth, cloud and specular map courtesy of oera.net (which seems to be down as of the moment of this post)

Cornel Box Fly

I created a simple bluish-grey Cornel Box and lightmapped it with beast lightmapper in Unity. I played around with the settings a lot more in order to get a very nice over head lit look. I was able to script the camera fly in only a few lines of code. A nice polished piece for just a little bit of work! Give it a click and watch!

Unity City

Modeled by Sean McDonald
Before hand, this scene had one directional light and quite a few draw calls that slowed performance. I had the camera in forward render mode (no point lights so I don't need deferred render mode). Then I light mapped the entire scene and changed the rendering path to Vertex Lit. This immediately gave me a much better frame rate. I then baked in Occlusion Culling so that only the geometry that is seen by the camera is sent to the render pipeline which yielded a well optimized environment