I like dark, brooding apacalyptic scenes.  Maybe I should give the Terradome a try.  (I don't own that particular background system, but I have a bunch of others: IC, Microcosm, Cyclorama, Millennium Enviroment, etc.) 

I also own several of FirstBastion's ground props.  Thanks for reminding me of those.  I'm going to try using those with the Envirosphere and Vue-rendered background images.