I recently found the work of this Argentinian artist Mart Aire who painted a lot of walls in the streets of Buenos Aires. Here you can see a nice collection of my favorite ones featuring bicycles. On Flickr, you can find more of his work.
I want to help 10 000 000 people around the world learn how to ride a bicycle and find the joy of cycling to work. Thank you for being a part of the Yes Cycling community.