Super Low Poly Trees tutorials/advice

I was just wondering if anybody could point me in a good direction to learn how to make low poly trees and bushes and such, like in the World of Warcraft game as seen on http://www.blizzard.com/wow or just give me some good advice on how to make them....speciffically leaves and such, the only thing Ive thought of, which Im about to go try, is to make the trunk, and then make a plane and use transparancy maps, bump maps, and diffuse maps to make the plane look like a lot of leaves....but I havn't tried yet, so I don't know if that will work.