Apparently these two new star types are the only additional graphics? I was expecting something much more involved for the file size. How about if someone creates a "comet" and implements the comet in the system files?

Yeah, it would be stationary but it could still look cool in the system window. Or how about if someone creates some more interesting nebula backgrounds? The whole system doesn't have to be one featurless fuzzy/cloudy color. We could have a swirled nebula with interwoven colors or even a "ring" nebula with a visible star remnant in the middle and ring of denser stuff against a background of thinner haze that might let a star or two peek through. And some obviously 'distressed' stars in various stages of flares and eruptions would be good for scenario builders once the map editor comes out.