Refused by His City, Man Jailed for Painting a Crosswalk. “Whitney Stump was tired of drivers ignoring stop signs at an intersection in his Muncie, Indiana neighborhood. After futile attempts to get the city to install crosswalks, Stump took matters into his own hands and painted one in at the corner of Dicks and North streets. Then he got arrested.”
Underground Restoration. “For a year from September 2005, under the nose of the Panthéon’s unsuspecting security officials, a group of intrepid ‘illegal restorers’ set up a secret workshop and lounge in a cavity under the building's famous dome. Under the supervision of group member Jean-Baptiste Viot, a professional clockmaker, they pieced apart and repaired the antique clock that had been left to rust in the building since the 1960s. Only when their clandestine revamp of the elaborate timepiece had been completed did they reveal themselves.”
Wow! Back in March 2006, I blogged an idea installing a compass rose at subway exits to help emerging travelers find their way. I posted a stencil design to help inspire action. Three weeks later, graffitti roses appeared in lower manhattan. And now a year-and-a-half later, the New York City Department of Transportation announces a plan to implement it.

The DoT will test the designs in midtown, around the heavily touristed Grand Central area. The context specific labels are a nice innovation, not just pointing north, but naming the nearest street in each direction.
See the official DoT press release here and a NY Times article here.