Pedestrian bridges are cool. Things underneath bridges are cool. Bars under bridges are cool. Bars that play Snoop are also cool. Ponyfish Island is a great example of using of urban space.
The idea of QR Codes with public art and walking trails had recently come up, and I saw it in action in Melbourne with the Laneway Commissions. The codes are captured by a smart phone that redirects you to more information and website.