Apple doesn’t really want you to fiddle too much with the appearance of Mac OS X . But, hey, it’s a free country, and if you want to do just that Flavours from Interacto Labs will let you.
It’s a Mac application to change the OS X appearance. Flavours — which has full Retina display support — allows users to create, apply and share themes. The application features a local theme gallery and an online store where users can download and publish their theme creations. Shipping with an embedded intuitive WYSIWYG editor, it allows users to create themes quickly.
Flavours requires Mac OS X Lion or Mountain Lion. It’s available for US$16.18 and can be downloaded from the Flavours website (http://flavours.interacto.net).