I love the question that juliamarcela over on Livejournal asks: What does Draenei skin feel like? Obviously Tauren are hairy cows, and almost all the other races are more or less Human (even if the color is a little different). But the Draenei are completely alien. Sure, they're probably not scaly or slimy, but it probably feels different than most skin we know. I like julia's suggestion, too: like shark skin.
And I think I like that question so much because it brings Azeroth alive for our senses. What do mana potions really taste like? What does Shadowmoon Valley smell like? The prairie in Nagrand is probably a little firmer under your feet than the lands of Azeroth (considering it's just rock down there), but Swamp of Sorrows is probably a muddy mess to get through. And what does it feel like when you actually pass through the Dark Portal-- do you get to watch that scene from Stargate as you fly through the stars?
I'm known to DM a D&D game on occasion, and I can tell you that there's no better way to bring a fictional setting to life than to imagine it through all of your five senses. From Draenei skin to what surely is a hot sulfur smell drifting through the Burning Steppes, I find it extremely interesting to think of what being in Azeroth would really be like.