Couple suggestions to add more cosmetic options for death knight players:
1. Raise Abomination back as at least a glyph, at least for Unholy
2. Possibly allow for death knight players to choose their eye color based off spec, color corresponding to Frost/Blue, Unholy/Green and Blood/Red, in the Death Knight Order Hall there is a trainer who has red eyes, this customization isn't currently available to any player elves wanting to be a Death Knight, however the Night Warrior customization is?, not a problem, just an observation.