GLUB from Madrid spent the whole month of February 2014 drawing non-stop. You can now download his sketch book [pdf] and see some of the actual pieces here.
Glub Blackbook 2014
6 fantastic pieces by Nerone in London streets. More to come.
Big cat by Utopix in Villejuif, Paris. The eyes are synchronized with the traffic light. [Stopmotion gif here]
the 7 latest walls from URI in Barcelona and Girona.