A bit late but here is a selection of very good & interesting photos posted last fall on ekosystem.org. Photo of the TGV by OKS crew.
Fall 2014 photo selection
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.
Black geopmetric shapes by Simek in Athens, Greece.
Pez in Miami + BR1 in Madrid + Vyrus D’Oliveira from Brazil + Ben Slow in East London + Sendra