My Five Favorites:
W.A.F.F.L.E.S. Team 4476. Trompe L'oeil rules
http://i.imgur.com/igAbrxk.jpg
Party Goat Team 190 Gompei and the Herd. The blurry Photo adds to the art.
http://i.imgur.com/FjLklh7.jpg
Team 4039 Makeshift Great Palette and geometry.
http://i.imgur.com/iKc5ABh.jpg
Team 2016, Mighty Monkey Wrenches. Very Piet Mondrian
http://i.imgur.com/rXc6qYM.jpg
My Grand Prize Winner:
4707 TEAM FORCE from the Dominican Republic.
http://i.imgur.com/0QZyB3a.jpg
Structural Greek Revival references
http://i.imgur.com/5hvwT2i.jpg
Dreaming Robots.
This team's crate has a real art vibe going on.
The best Rookie Team crate:
4930 Electric Mayhem
http://i.imgur.com/UPPiumL.jpg
Which I have heard was made for them by 1511 Rolling Thunder after their Rookie All-Star Award at FLR.
With Bag and Tag, I fear that this art form may eventually pass, but for now....