I have been playing around with procedural generation of a random starfield with nebula using Perlin noise. I have come up with something that looks almost, but not quite, entirely unlike this:
Each new image I create looks entirely different. There are 7 layers to that image.
Red, Green, and Blue gradients (Perlin noise with different seeds).
Background and Foreground Stars (Also Perlin noise).
Coverage and Billow Masks (You guessed it.. Perlin noise).
Each layer has different frequencies, amplitudes, brightness, etc... that can be adjusted. You could also use different colors to get a more realistic result.
