How to Make the Mac Dock 3D or Transparent in OS X Yosemite
Many Mac users noticed the Dock has become restyled in OS X Yosemite to be more flat, but if you want to get a 3D dock again, or to customize the appearance a bit, you can change the Dock look to be 3D, a different color, or even make the Dock appear transparent.
Modifying the dock appearance in OS X requires the application called 'cDock", you can learn more about using this utility to customize your Mac Dock in our original article here:
http://osxdaily.com/2014/10/29/get-3d-dock-in-os-x-yosemite/
If you already know you want to get a 3D dock again in OS X Yosemite, you can download the cDock utility from SourceForge at the link below, it's easy to use and works very well, you will need to right-click on the apps icon and choose "Open" to get it to launch beyond GateKeeper in OS X:
http://sourceforge.net/projects/cdock/
Discovery much more at http://OSXDaily.com