http://purl.org/tcl/home/man/tcl8.4/TkCmd/chooseColor.htm

aka tk_chooseColor

[[Someone want to add an example of how to use this?]]
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Okay, this is about as simple as is gets:
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 button .b_fg -text "Set Foreground Color" -command {fg_color}
 button .b_bg -text "Set Background Color" -command {bg_color}
 label .l -text "Foreground Color on Background Color"

 grid .b_fg .b_bg -sticky ew
 grid .l -row 1 -columnspan 2 -sticky ew

 proc fg_color { } {
	set color [tk_chooseColor]
	.l configure -fg $color
	}

 proc bg_color { } {
	set color [tk_chooseColor]
	.l configure -bg $color
	}

 wm title . "tk_chooseColor Example"
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