Even better, Nightborne as a Night Elf Subrace. I'll post my list of subraces for each class, updated with Legion races.
Human
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Azotha: Ugly children of the Vrykul, Barbarian and Vrykul features. (RPG canon only)
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Half Elves: Children of Humans and High Elves, refugees from Theramore.
Dwarf
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Dark Iron: From Blackrock Mountain, dark skinned with fiery eyes.
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Wildhammer: Traditional tattoos and tanned skin.
Gnome
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Leper: Irradiated Gnomes with restored sanity.
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Mecha: Gnomes 'blessed' by Mimiron, certain Mechagnome features remain intact.
Chris Robinson Approved.
Night Elf
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Nightborne: Ancient Elves, evolved due to the effects of the Nightwell.
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Cenarion: Dryad and Keeper of the Grove features.
Draenei
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Man'ari: Twisted, demonic servants of the Legion. (We know Demons can secede from the Burning Legion if they find an alternate source of power, for example Illidan's Demons & the Reliquary of Souls)
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Broken: Draenei twisted by dark magics. (
Can in fact work with Draenei Skeleton)
Worgen
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Bloodmoon: Northrend Worgen, polar wolf features.
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Blackhowl: Worgen infused with the Blood of a black Dragon. Scales and Drakonid features.
Orc
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Mag'har: Uncorrupted brown and black orcs, natives of Draenor.
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Half-Ogre: Mok'thanal Orcs, a la Rexxar.
Troll
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Forest: Mossy skin, warpaints
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Ice: Cold, pale skin, white hair
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Sandfury: Coarse, cracked pale skin, black tusks.
Tauren
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Highmountain: Moose Tauren from Highmountain.
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Taunka: Cousins of the Tauren from Northrend. (Would require head remodel)
Forsaken
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Elf: Undead High Elves, pointed ears and elven hair styles.
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Skeleton: Completely fleshless undead (Requires new model)
Blood Elf
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Darkfallen: Last remaining members of the San'layn, welcomed into the Forsaken by Sylvanas.
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Felblood: Some Blood Elves overfed on Fel Magic, causing effects beyond simply green eyes. Sprouting small wings and horns. Still friendly, however.
Goblin
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Gilgoblin: Aquatic goblins, created by Hobart Grapplehammer.
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Tinker: Due to numerous engineering accidents, certain body parts replaced with volatile goblin technology. Blackfuse style.
Pandaren
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Tuskarr: Keep the body, change the head to a Tuskarr's.
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Grizzly Bear: Cosmetic option, be a Furbolg. (Possible remodel)