When Apple releases a new version of OS X inevitably there are Mac users who try it out, then want to switch back to whatever version they had before. I feel your pain. Change can be a bitch. A good example is the flat 2-D look in Yosemite. Some Mac users prefer the 3-D look of previous OS X versions.
Here’s a way to get both the latest and greatest but have it look like a 3-D version of OS X from yesteryear. The utility app is called YosemiteRevert, and as you’d suspect, it merely gets rid of the flat 2-D icons and replaces them with 3-D icons (and, as well all know, future versions of OS X will more than likely revert back to 3-D and Apple’s designers will call it a breakthrough design).
Out with the new, in with the old. Old 3-D icons replace the flat icons from OS X Yosemite, but on a flat Dock.
What YosemiteRevert does is simply swap out Yosemite’s icons for OS X Mavericks icons. That includes icons for built-in apps, Menubar icons, Finder icons, the default folder icon, even icons in System Preferences.
The app is something of a work in progress and seems to improve with each iteration. The new version changes the OS X Yosemite system fonts to those used in Mavericks. Window backgrounds and buttons are not changed. Yet.
So, if you loved the look and feel of Mavericks, but have already upgraded to OS X Yosemite, YosemiteRevert can give you the best of both worlds for just a few bucks.