by NS » Mon Jan 17, 2011 8:15 pm
You could try masking out some shapes on a white solid and then feathering it up a lot and playing with opacity until it looks all wispy, and then animate the masks to give it a little motion.
Other then that idea I don't got much, but if you have AE you could try making what you want in there and then exporting out and importing that into vegas. You'd prolly have better results making what you want in AE.