I find this so super-annoying... why do people use all-uppercase "MAC" to refer to Macs?
I don't get it.
To answer your question: Stardock don't offer Mac versions of their programs and while there are similar tools on the Mac (although some tools are unecessary as the Mac GUI already supports the features), there is nothing like Stardock's skinning solutions.
But you can change the icons in the Dock if you want.