London has an awesome graffiti culture. To learn more about it, we did a 4 hour graffiti tour&workshop with Alternative London.
http://www.alternativeldn.com/original_street_art_tours/london_street_art_tour.php
We spent the first hour of the tour walking through the streets as our guide, Kia, opened our eyes and minds to the world of London street art. His excitement and passion were contagious, so we both gained a new appreciation for the various styles and works that he pointed out to us.
The most fascinating piece that we NEVER would have noticed without taking this tour was done by a street artist who paints the gum that's stuck to the sidewalks!!
We returned to their office, a big green bus in a yard, and started to make our own graffiti stencils. They taught us some basic techniques using the spray cans and then set us loose to test our our graffiti skills on the practice boards!
The tour was so interesting that on our way home, we decided to detour through Bricklane - another area known for its street art.
Our London graffiti experience wouldn't be complete without checking out the Millennium Bridge. You could basically walk the entire bridge without ever noticing anything (and most people do!). If you look down and pay close attention, you'll start to see the hundreds of pieces of gum that have been painted!
Check out some More images for millennium bridge gum