Paint color, that is! I have decided to make the fleet dependent on a base coat and wash 'technology' because quite frankly there is no way I can do any justice to all the tiny detail on these ships.
In addition, after a couple of games, which admittedly had crude tactics used, I can see an upper limit of ten or so ships in a scenario for the game length I like and have the availability to play. So with that in mind, I an create a scheme for at least three fleet groups.
The first group is heavy on Star Bombers and star destroyer size hulls, with a cruiser as the big gun or flotilla leader. So in this manner, I will have 5 star bombers in the 'green with stripes' pattern. The pattern is loosely based on tree frog coloration, with the stripes serving as a method to identify individual ships. These are supposedly mostly amphibian based life forms, after all.
The basic color will be the hull color for the larger ships, but an oddly shared trait is the turtle head prow which calls out for a stylized face. Maybe, if I can get one I am pleased with the result.