I personally think its a good way to bring colors into the city. It is an improvement from the dirty gray concrete for sure. I know that there is a lot of great sidewalk art similar to this in Chicago such as the tunnel near Oak Street Beach. They recently added a colorful mural within the tunnel. If it was my decision I would paint something more meaningful other than legos! It also probably brings interest to kids. I really enjoy sidewalk art and it its a good way to substitute graffiti.
"Inthralld." Faux Painted LEGO Bridge in Germany. N.p., n.d. Web. 15 July 2012. <http://inthralld.com/2012/07/faux-painted-lego-bridge-in-germany/>.