How do I change the dock in Mountain Lion?

I found this link here: https://forums.macrumors.com/threads/1409195/ but it didn't work for me. when I turn transparency off, it adds the scurve files to the dock contents, but as when I add my own to it, they are changed back to the silver ones automatically. Has anyone figured this out yet? It's REALLY bothering me not to have a black dock. I replaced my entire dock app from my lion clone, and it actually worked... but it kept crashing and totalspaces wouldn't launch, etc. As crazy as this may sound, if I can't figure this out I'm switching back to Lion. It honestly bothers me that much because my menu bar, desktop, and icons are all black.