Please make a backup before modifying your system. ResExcellence is not responsible for any loss or damage of data.×
If you fancy changing the Finder icon in your Dock, you can do so by navigating to this path and replacing the finder.png file with your replacement:
/System/Library/CoreServices/Dock.app/Contents/Resources/finder.png
You can also change the finder@2x.png file with your replacement for retina displays.
Using Terminal, run this command:
sudo find /private/var/folders/ -name com.apple.dock.iconcache -exec rm {} \;
Restart Finder and Dock processes using Activity Monitor.