kinda the same i want to do. cool blog: http://www.worldofstencils.blogspot.com/
"Good stencils make the life in a city much more interesting and also give the city a special touch. Most of the stencils are to be seen as a message - so watch out ! This weblog is a collection of stencils from all over the world. I am trying to snap a photo of them wherever I see one. I would like to dedicate this blog to the people doing the stencils because they are the real artists behind it."