make ubuntu top/window bar and menu transparent
top panel:
http://www.linuxandlife.com/2012/05/ubuntu-panel-transparent.html
window title bar and menu(in the comment):
http://ubuntuguide.net/ubuntu-unity-enable-transparent-panel-and-windows-title-bar
http://www.jameswigley.com/2012/04/27/making-ubuntu-unity-look-beautiful-by-enabling-transparency/
