ubuntu change color of top menu bar in Unity and top menu bar in any window

How to install Ubuntu Tweak?

• Hit Alt+Ctrl+T to open terminal and run following commands:
  1. For Ubuntu 14.04 onwards, it's available in softxare sources, just type:

     sudo apt-get install unity-tweak-tool
     

  2. For older Ubntu releases:

     sudo add-apt-repository ppa:tualatrix/ppa
     sudo apt-get update
     sudo apt-get install ubuntu-tweak