Hey Hey Hey,
So here are a few of my backgrounds in progress. These first few are exteriors. NOW, It is very important to realize that all the exterior backgrounds will have heavy snow, wind, and rain effects going on in the finals shots (When I do some tests you'll see some more pics displaying that. So they will be darker, and more will be going on. SECONDLY, with these shots being composited in After Effects, I will be animating the clouds and such to move along screen, so never mind where they are now, for they will be more nicely laid out in "post".
(This one's got a bit of a lightning flash going on)