Unsanity today announced the release of ShapeShifter 1.0, a new product that enables you to change the overall appearance of Mac OS X by using “themes.” As the company puts it, “we’re not talking about just desktop backgrounds and icons here, we’re talking about everything — the look of windows, menus, buttons, absolutely everything.” ShapeShifter lets you change the overall appearance safely, quickly, and reliably; quickly preview themes without actually applying them; use Jaguar themes in Panther; install different themes for different users; and add and remove themes “effortlessly.” ShapeShifter sells for US$20.