Nebula settings in FRED:



Yellow nebula (like a supernova remnant)

Pattern: nbackyellow
Poofs: 1, 3, 4
Ambient: 255, 215, 127
Skybox: NebulaYellow.pof



Blue nebula (any reflection nebula)

Pattern: nbackyblue
Poofs: 1, 4, 5, 6
Ambient: 127, 127, 255
Skybox: NebulaBlue.pof



Cyan nebula (also reflection nebula think Pleiades and stellar nurseries)

Pattern: nbackcyan
Poofs: 1, 5, 6
Ambient: 127, 215, 255
Skybox: NebulaCyan.pof



Green nebula (reflection nebula)

Pattern: nbackgreen
Poofs: 1, 2, 3, 4, 5, 6
Ambient: 127, 255, 127
Skybox: NebulaGreen.pof



Purple nebula 1 (like Orion Nebula)

Pattern: nbackpurp1
Poofs: 3, 4, 5, 6
Ambient: 255, 127, 215
Skybox: NebulaPurple1.pof



Purple nebula 2 (like Witch Nebula)

Pattern: nbackpurp2
Poofs: 3, 5, 6
Ambient: 215, 127, 255
Skybox: NebulaPurple2.pof



Red nebula (any emission nebula)

Pattern: nbackred
Poofs: 3, 4, 5
Ambient: 255, 127, 127
Skybox: NebulaRed.pof



Orange nebula (supernova remnant)

Pattern: nbackorange
Poofs: 3, 4
Ambient: 255, 192, 127
Skybox: NebulaOrange.pof



Note: If you use skyboxes, you will get opject pop-up. This'll have to be solved by someone else.
Also, there are animated poof sequences included too. Haven't managed to get those to work though.