I want my clients to be able to pick colors for buttons,table borders, table headers ect...

This way they can get an idea of what the site will look like before it's built.

I'm looking for something intuitive like this:

http://www.pagetutor.com/colorpicker/index.html

Any ideas how I can get this done?

I've looked for hours and hours and hours but nothing!

Thanks

http://www.vancouvertransfer.com