Basically, I found 2 tutorials with other softwares (HitFilm and After Effects) on how to create an animation using an image of a nebula (from Hubble). I tried to use the same process using blender and other tests I tried by myself. I prepared 2 blend files if you want to see,
download here : http://rapidshare.com/files/1303190142/Nebula%20Blends.zip
Tutorials if you want to see the concept :
WIth Hitfilm : http://www.youtube.com/watch?v=Xdv0v_of1tg
With After Effects : http://vimeo.com/34680018#at=0

Link where the images were found (free and you can use them as you want) :
http://hubblesite.org/gallery/album/nebula/+1

Music : Dan-o - Starburst Dreams
http://www.danosongs.com/#music