Blender 2.5 volumetric nebulae tutorial?

Well, seeing the beautiful skyboxes on this forum, I thought that there is none that's actually IN a nebula. And, since Blender 2.5 has the marvellous volumetric materials, I think I could make one myself. However, I need a tutorial on making these and there doesn't seem to be any. Anybody got any ideas?

ive tried making space skyboxs using terragen with not much luck. tutorials are lacking. sev is the person to ask about making space skyboxs in blender

Well, I kind of figured it out myself, however the first skybox I've rendered got butchered by the compositing, I guess. Also, I don't know if these will fit altogether at all (ie. did I use the correct lens settings in camera). See .blend here: http://ompldr.org/vNXU4cQ

Nebula akyboxes ???
I can suggest this of my creation :

http://bartuc.altervista.org/files/nexui...skybox.zip

http://bartuc.altervista.org/files/nexui..._space.zip

http://bartuc.altervista.org/files/nexui..._space.zip

They are no perfect but i can make more dettail