Forest trolls and ogres for Horde, high elves and Wildhammer for Alliance. They make the factions feel much more complete and help a lot with identity. I know at least some here know my stance on forest trolls so I’ll hold off for now ;(
Send Bazgak some love, he’s awesome in the race request community, and he made a thread for saurok. Lots of great ideas there on how they could become playable. If you think you have some new ideas, send them his way. He’ll go bananas and talk your ears off, it’s great.