http://www.fubiz.net/en/2013/10/22/layers-of-color-revealed-on-walls/
German artist 1010 transforms with talent the city walls he visits with graphics interventions of high quality, giving a sense of depth through layers of paint.
Click through to see more amazing images: http://www.fubiz.net/en/2013/10/22/layers-of-color-revealed-on-walls/
LoneTomato808's Blog 
This is so cool, such a different experimentation of colour from what we usually associate with urban art