I ran across this building in a magazine a few days ago and thought it was a very unique solution to a standard box tower.  The building is called the Aqua Tower and designed by Studio Gang Architects. 

The primary building is a standard rectangle tower but the facade is animated with a series of projecting balconies.  The result I think is quite interesting.  Below are links to some images from the project rendering and actual images of the project. 

http://plusmood.com/2009/06/aqua-tower-studio-gang-architects/

http://www.studiogang.net/projects_e1.htm

http://images.google.com/images?q=aqua%20tower&rls=com.microsoft:*&oe=UTF-8&startIndex=&startPage=1&um=1&ie=UTF-8&sa=N&hl=en&tab=wi