StyleVista is a program designed to allow users to change the style of Windows Vista’s glass user interface. By default, Windows Vista’s glass UI has a hard-coded opacity (how easy it is to see through it) and is colorless.
StyleVista lets users change that opacity and add color to the active and inactive window states.
Eventually, StyleVista will allow users to apply .VistaStyle files which will let users customize the GUI elements further.
It’s currently a free download.