It would require changes to the code, the way the engine handles nebulaes.
I think it's possible to get that effect without coding, using effects ( anis, like explosions, asteroids, whatever ) that are triggered somehow.
I hope someone can tell me if it's possible to use the clouds ( pattern ) in conjunction with a transparent background ( poof ). Like i said earlier, i get an blue background with that file i mentioned earlier.
Either i did something wrong or the engine don't like transparent backgrounds as poofs and colors them blue.
I hope it's the former...