I played around for a bit, snagged a starfield image off a NASA site and put it into the client. I've always thought that the night sky in Istaria was very plain and kind of boring looking. It does not work perfectly because it stays somewhat visible during the daytime. I'm not sure if that can be fixed with how the skydome works. But I like it regardless.
You can get the mod file here. Just drop it into the resources_override folder and let me know what you think.