I asked a similar question amongst a whole bunch a little while ago.
Let me explain.
I think it would be great to have a colour table much like Homeworld or Dawn of War.
THis gives an infinite variety of colours and symbols.
It would also be great to actually be able to paint larger portions of the ships, atm I think its more like painting the trim rather than much else.
Its ok the way it is, just would not mind some more variety, especially in the colour department. I don't even think their is an option for white.
The ability to paint ones fleet, really does add to the longevity of the game.