How to change color AND width of non overlay scrollbars in Ubuntu 12.04

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http://askubuntu.com – I know many people have complained about the almost invisible and not usable scrollbars in recent versions of Ubuntu, even after removing or disabling the default overlay scrollbars. I wonder how can I easily change their color AND width. I have a 13.3 inches monitor with a 1600*900 resolution and I can barely see them. I already changed Firefox, LibreOffice and some other software's scrollbars using GNOME Color Chooser. By the way, I'm using Unity. Thanks! (HowTos)