Ya but which mushroom do you use that looks right? And it's not just the mushroom it's also the pillar for flame and all the flames at the bottom:

http://phenomenaonbreak.files.wordpress.com/2009/06/nuclear-explosion-badger-tests.jpg

I need an obj that has the right basic shape with materials for the fire and the smoke. Wouldn't that be fairly easy to do in something like zbrush? lol