Commuinity World Building Project (World the Dragons Rule)

[Zaydos]

Purple from the Dragon Magazine Compendium would work quite well (LE, kingdom building, egomaniacs)

Deep Dragons (Monsters of Faerun)

Possibly Yellow and Orange Dragons (Dragon Magazine Compendium) and Brown Dragons (Monsters of Faerun)

There are 3 evil aligned ferrous dragons in dragon magazine 354.

Hex Dragons (evil versions of Tome dragons; same issue of dragon magazine).

Edit: I've also homebrewed a few dragons, but it appears I've only posted the two planar dragons I made. They're for Baator and Arcadia since those are the only (standard) planes missing planar dragons (the ethereal has 2).
http://www.giantitp.com/forums/showthread.php?t=129046