I love this piece presented last week by PSFK. A group of bicyclists spilled 500 liters of water-based paint onto the asphalt of the Rosenthaler Platz in Berlin, Germany. Passing cars and buses created colorful streaks and patterns in the intersection.
I wish this had been a brand trying to create buzz...but it is definitely a neat idea.
Check out the video below to see the traffic paint experiment!