I saw some in Albuquerque when we were driving Route 66 in 2013. To be fair, most were murals but there was no sign of the sort of criminal damage (some refer to it as graffiti) I see all too often when walking round some parts of London.
Actually, come to think about it, there is a fair bit of this type of artwork around the Truman Brewery end of Brick Lane - but there's a lot of the other stuff as well