Excel color-pick eye dropper

Hi

I am trying to create a front-page, control-panel style user form that among other things would enable the user to recolor certain aspects of the entire workbook based upon an eye-dropper tool that would pick any color from anywhere on screen (inside or outside of excel).
Ideally, I would like it to be a simple button, click on color, and then have a square next to the selection panel that would display this color. So an add-in would be the most viable solution, however, any form of coding that works is good enough for me.

I am currently at the stage of being able to enter a hex value into the form manually, display the color box using that hex-color in the form next to the selection panel, and upon completion of the form, edit which colors I need within the entire workbook.

And I have an external application that will select the hex value of any pixel's color and paste it in the clipboard, so if could figure a way to run the small application upon the button-click, take the value from the clipboard, and then close the application, that would work.

Is there any way out there to be able to achieve this color-picking selection within excel, or am i really over-stretching myself on this one?