Let's go a little classier (and artsy) than a tree made out of Mountain Dew cans.  Let's go with one made out of discarded glass water bottles.  Not plastic, glass.  That's how you know it's fancy.

While I'm not crazy about the implementation of Paprika's Ice Tree, I love the way it looks.  Now, if it was me, I wouldn't hang the bottles from the ceiling like they chose to.  I'd put a lap in the center, make the base a small glass coffee table or lazy Susan with a central post, and build the glass pyramid around it.  I think it'd be a more ethereal, yet still Christmas-tree looking sculpture. 

That said, I love the fact that they reused those old glass bottles, and I love the way it looks with the lights hitting it just right.  It really is like a tree made of ice, but unlike ice sculptures, this one won't melt.