Any particular sources you recommend? I am actually surprised none of the draconomicon's have said much on the subject.The five-headed dragon is a bit fickle, so I can see her dropping a consort (HARD) on a whim.
The most detailed lore work on chromatic dragons was done in the Dragonlance setting IMO. I would look to how they characterize the different types to envision consorts. I would think that any consort of Tiamat would be representative of their sort of dragon in general.