user defined color in shortcode

I’m not sure where to ask this question.

I need to give users access to a color picker to select a color. My guess is that the hex color code would need to go into a custom field, but that’s not a requirement for me.

Then I want to insert the hex color code into the main content block (i.e. not in a sidebar) of a page using a shortcode. The color picker could certainly be in a widget.

I prefer a shortcode, but am willing to look at a php solution to this.

TIA,
Rick.