Green Bike Lanes in Brooklyn

We came across these bike lanes in Brooklyn on our trip to the Five Boro Ride. With all of the excitement over the bike boxes in Portland, it was great that we came across these walking from the Brooklyn Bridge to the Museum or Art.  
There was nothing special about the intersection treatments other than the approach was green. It seemed like a little bit of a strange application on this neighborhood street.  
Why are they green? The National Committee on Uniform Traffic Control Devices (NCUTCD) preferred green as opposed to the blue that Portland used in the initial study because blue is reserved for Americans with Disabilities.