[xandrius]

Honestly, if we're speaking of most graffiti (generally just tags in the same boring fashion) visible from a train, I'd rather to be looking at a phone screen.

At least the phone screen could be displaying something interesting but most graffitis are pseudo-artistic "I was here" tags. I wish more of that paint was used to actually make a place nicer rather than worse. And don't get me wrong, I'm totally ok with guerilla, technically illegal actions taken by citizens to improve their surroundings but most graffiti are far from that.

[WorldPeas]

The graffiti on the MTA from CT to NY is pretty nice, a lot of puffy colored tags, I think it's best not to have too many tags, keeps the good ones front-of-mind. Don't get me wrong, the less-is-more ones are nice too, VEO, anyone?