I've switched back to Linux Mint 16 after a month of hiatus from my desktop/laptop. This time I have gone for a more darker and sleeker feel to the overall interface. I mashed together different theme to make it look more natural and flawless.
Window borders: Adwaita-X Dark
You can change all your settings in the Themes section in Settings.
If things go awry and you want to refresh your Cinnamon interface, press Alt + F2 and type r.
You can also click on Restore default theme in 'Installed' themes to reset everything.