Sublime Text Utilities - tools to customize Sublime or make it even more useful.
This re-styles your sublime text sidebar to be dark, it fits default Monokai theme.
Save the Default.sublime-theme file into packages/Theme - Default, make a backup of your original if you want to be able to go back easily.
On Windows - finding the "Packages" folder may not be super intuitive... Probably the easiest way to determine the path is to have Sublime find it for you by selecting "Preferences"->'Browse Packages...". This should open the packages folder. Create a folder called "Colorsublime-Themes" and copy this "Default.sublime-theme" file into this folder. Once its copied the side bar should change to this new theme immediately.
Good luck!
Based on: