I am sure you can imagine what I have in mind (if you can't, few links are at the bottom of the post) Trailers usually have some sort of message at the end (release date, name of the game/movie, etc). Some have this running stormy clouds, very dark and subtle, sometimes with occasional flash.
I am wondering how to simulate this in After Effects. I have not yet tried this since I really can't figure out where to begin, I am thinking maybe use some Photoshop generated clouds, layer stuff and sprinkle it with dash of AFX magic, but I don't really think this would by satisfactory. Should I maybe use some particle generator? I am pretty new to particles and aside from the regular rain or sparks I have very little experience in this field.
Or is there some other way? Any insight from someone more experienced in this particular field would be great help!
I really don't want to use stock footage.