BlueHaze is a ShapeShifter theme that changes the entire graphical appearance of Mac OS X. It is currently unfinished but the developer wants to let people try it out. For the most part it's done, however he has some mask fixing to do and there are a few missing pieces. A blue gradient desktop picture is included.
Version 2.0 now sports a smoother appearance, more app skins, and better buttons.
ShapeShifter 1.2 or later
*Previously available here