Maletrain: To make it practical, how about a railroad, probably one of the regionals, starting a program to allow artists to use their cars? Even among "taggers", there are both common vandals and true artists, and some of those artists, given the opportunity, can make a car look good. It wouldn't have to cost the railroad anything. Have the artist take a short safety course and sign a release, put the car on an unused siding at the company shops, blue-flag it, and let them paint.