What would they smell like?
Here's my list:
Alliance
Draenei - Grapes
Dwarves - Old Spice
Gnomes - Frosted flakes
Humans - Smell yourself.
Nightelves - Rainforest
Horde
Bloodelves - Perfume
Orcs - Cherries
Tauren - Cow fodder
Trolls - Weed
Undead - Pineapples