Jayko's comment though caught my eye the most because I just ordered about 300 dollars worth of tree parts from PickABrick just moments ago. Brown is a color you rarely see in a real tree my friends, when my bricks arrive in about a week, I'll build the first one and you'll see what I mean when I say "The trunk of a tree is not brown, it only looks that way" To get the perfect tree actually several colors must be used. Mostly white to black and every grey in between.
Ooh, very true... well then i'll have to throw some of those in there then too! XD
@Blade: That's very true too.... I guess I would just incorporate a mindstorms robot inside with a motor and temperature sensor!