Well unfortunately, it seems my request is not to be. As commenter so2 pointed out the other day, Illidan is not actually a humanoid, so he's not affected by the Beerfest goggles that turn everything into a Gnome (Alliance) or a female Orc (Horde). Bummer-- I really wanted to see Illidan as a tiny little Gnome guy.
However, as you can see above, Gruul is technically a humanoid. And thanks to reader Nate S., we've got a picture of Gruul in his lair, looking as attractive as a female Orc can look. I don't know how much Mudder's Milk you have to drink to make Gruul look that attractive, but it's got to be a whole lot of alcohol.
Of course, the other thing about Gruul is that as the fight goes on, he gets bigger, so I'm still curious to see if, while wearing the Gnome glasses, you could get a picture of the raid fighting a giant Gnome (heck, who needs the glasses-- Blizz, here's my official request for a giant Gnome instance boss in Northrend). And I think a lot more experimentation is needed with these goggles, anyway-- can we see Thrall as a Gnome or Bolivar Fordragon as a female Orc?
Update: Ask and ye shall receive. Thanks, myrlin!