Here’s a good example. Way back in OS X Lion, Apple removed the color from the Finder’s Sidebar icons. Why did they do that? I like a little color in the Finder. Here are a couple of ways to get the color back.
Of the two, I prefer to use SideEffects, though ColorfulSidebar works well. It just has a few more steps and some of the instructions are in Japanese.
SideEffects does exactly want you want, too, sans the Japanese examples, and puts the color icons back into the Finder’s Sidebar.
The app works on OS X Lion, Mountain Lion, and now Mavericks. Unlike ColorfulSidebar, SideEffects uses a single installer for all the background goodies to make it work.
Take a look at the Sidebar in your Mac’s Finder now. Then compare it to the color added by SideEffects.
SideEffects also lets you use OS X’s System Preferences to change the icon size in the Finder’s Sidebar.
If there’s a caveat with either, it’s the needed installation of SIMBL, an app enhancement loader developed by Mike Solomon, which has been a bit problematic for some Mac users. Other than that, there’s no better way to add some color the the now colorless Finder Sidebar.