generating clouds with Phoenix?

I was wondering if anyone could suggest a good workflow for making realistic looking clouds using Phoenix?

Thanks!

Have a look the following threads:
http://forums.chaosgroup.com/showthread.php?67525-Clouds&highlight=cloud
http://forums.chaosgroup.com/showthread.php?79496-Realistic-static-clouds-in-Phoenix&highlight=clouds

Thank you! Strange these didnt turn up in my search! Much appreciated!