I am not a great fan of Graffiti or at least I wasn't until I came across this site - Graffiti Art of the Day. It seems to be a tumblr site that posts graffiti finds sent in by others. This is the one that I loved the most.
Some graffiti I find a little frightening in that it suggests angry mobs bent on destruction. However, this one is humorous, as are a few others from the link. Here are a few that I have found in the last year or so.
I love street murals
From my day of photographing things red.
Zorro lives - Have a great day.