There are a lot of mods out there that add new ships. Some I find quite good, others I find excessive (too many turrets, too much shield/armor/power).
Do you think the randomly generated starting systems lack character? Then this might be the right mod for you!
Metal Maidens Mod adds Metal Maidens from the anime mobile game Metal Waltz / Panzer Waltz
This mod is aimed at people who would like a “faster game speed” experience, especially during the slow early game, without actually changing the game speed from Normal to Faster.
Stargate Project Mod adds several features of the stargate universe. It expands the race creation with things like emblems and name lists.