I've probably posted this a dozen times but here's my list of alternative race variations.
Human
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Azotha: Humans from the Highlands of Strom, still retaining minor Vrykul Features.
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Half Elves: Half Human, Half Elf. Lighter Physical Build.
Dwarf
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Dark Iron: Dark Skin, Firey Eyes and Hair.
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Wildhammer: Body Tattoos, Wild Hairstyles.
Gnome
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Leper: Diseased, Green Skin. Restored Sanity.
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Mecha: Curse of Flesh partially reversed by Mimiron, half-Mechagnomes.
Chris Robinson Approved.
Night Elf
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Nightborne: Dark Elves, addicted to the magic of the Nightwell.
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Cenarion: Dryad and Keeper of the Grove features.
Draenei
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Eredar: Original Eredar from Argus, slimmer proportions.
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Broken: Draenei devolved due to Fel Energy
(
Can in fact work with Draenei Skeleton)
Worgen
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Bloodmoon: Northrend Worgen, Polar Wolf, Heavier Proportions.
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Blackhowl: Worgen corrupted by Black Dragonblood. Drakonid features.
Orc
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Half-Draenei: Orcs with Lighter Proportions (movie Garona).
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Half-Ogre: Mok'thanal Orcs, a la Rexxar. Heavier Proportions.
* Simply add Brown Skin Types to original Orcs for Mag'har.
Troll
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Forest: Mossy Green Skin, Warpaints. Heavy Proportions.
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Ice: Cold, Pale Skin, White Hair. Heavy Proportions.
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Sandfury: Coarse, cracked pale skin, black tusks. Light Proportions.
Tauren
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Highmountain: Moose Tauren from Highmountain. Tribal Tattoos.
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Taunka: Northrend Tauren, with a Bison Head.
Forsaken
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Undead Elves: Undead High Elves, pointed ears and elven hair styles.
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Skeleton: Completely Decomposed. 100% Spooky.
Blood Elf
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Darkfallen: Last remaining members of the San'layn, welcomed into the Forsaken by Sylvanas.
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Wretched: Blood Elves who have suffered Mana Withdrawl and become Withered.
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: Coo Coo Cachoo.
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Grizzly Bear: Brown Hair, Furbolg Aesthetic.