I just recently came across an interesting documentary about street art called "Exit thru the Giftshop".
The film depicted the rising trend in street art across the world and some of the key players who generate art out of unlikely places and objects. I gained an admiration for those artists that bring humour and interest to the areas of a cityscape where formerly there was nothing of interest, often putting themselves in the path of danger and outside of the limits of the law.
Here are a few images from the infamous street artist named Banksy also depicted in the film: