It works in some browsers only, and a big part of the skin.js has no relation to the color changer we want to use. To use this color changer with all navigators we need to change most of that file too. We can make it stylish and more beautiful with some changes on the CSS file and color_picker.js
As we can attach this to the database, it's very easy for a person who manage PHP/MySQL and he can do it in small time. (Don't beliee who say no)
If you have good competences then you can add it as a plugin and sell it and it will be very successful.