I offer my clients has a button that shows the color palette windows. once the customer chosen color, the color of an "active" rectangle changes to the color that the customer has selected.
* for the windows color palette I chose the plugin "Color Selector"
for more information: customer presses a button. the Pelette appears. the customer choose the color palette and then will turn off. a rectangle (Active) still big enough show the selected color. another active form. "png" will be placed above the rectangle a way to create a gloss effect