Ok, so, I'm a fan of those biological terror's in sci-fi. I mean The Flood, The Tyranids, The Zerg and others like them. I'd love to have biological ships, maybe in a DLC. 

I think it would be cool to have ships that have their own versions of the tech other races use, like you won't see an animal using a gun, but, they do have their own mechanisms. Such as instead of  a beam weapon they could be able to 'spit' with the same base result as a beam weapon. Like, their weapons would have the same stats as the 'mechanical' weapons, but with a different appearance. 

It would be cool if the biological ships could 'infect' other ships, and have a chance to take control of an enemy's ship. 

We already have a synthetic race, so why not have bio-ships as well?