Nebula Texture Enhancement Package
 Using the Particle Texture Kit addon by Scrooge McDuck, I used Paint.net
to make emission files that add different color textures to the nebula. You
can mix and alter colors and textures to achieve an even greater level
of variability in the nebula appearance by changing the names (i.e., color and now texture) in the scenario.
 Original contrail file is by Scrooge McDuck.
 Note: I added a yellow .dds file because my file was corrupted.
         I don't know if anyone else has found a problem with the yellow
         texture, but I thought I would add it in just in case.