Changeling is an GuiKIT for Unsanity's ShapeShifter that changes the appearance of OS X. The current version of Changeling only skins OS X and Safari, but a future version is in the pipeline
There is a an iconset available in the zip file, it's also in the process of being updated.
Sofa was the first itunes remote that I found that I tuly liked the principal of, and after playing with it a bit I wondered if skining was an option. So after contacting Cedric(the developer) I set about making Snow Sofa Skin, inspired by the iPod.
The interface for Changeling came about as a result of Snow