StreetArt is a Ploggle page of street art pictures here in London. Great collection.
I've seen many of these (e.g. this one) in real life. This seems to be some sort of trend and I genuinely appreciate this more than "graffiti"n:http://www.graffiti.org/dj/heal.html.
2 other fotologs with streetart content
http://streetart.antville.org#___an_open_Log_
http://fotolog.net/streetart
Other ploggle logs
http://-.ploggle.com#__6_-_-pics
http://1.ploggle.com#__20_pics
http://103.ploggle.com#__100_pics
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