Mustang Customizer is an marketing app from Ford where you can customize your Ford Mustang with various pain schemes, after market accessories, appearance packages, and more, to build your "ultimate beauty-shot". Most are actual parts from the Ford Performance Catalog, and you actually can custom built a Mustang just like that.
However, this is mainly man's version of "dress-up", as there's no driving or interior demo and such. It's strictly static, albeit nice overlays of various graphical elements, and there are a LOT of options so you can recreate almost ANY of the classic Mustang looks.
It's a big download though. Beware.