def method_missing(method_name, *args)
      if Color::X11Named.color_names.include?(method_name) && args.empty?
        color(method_name)
      else
        super
      end
    end
def method_missing(method_name, *args)
      if Color::X11Named.color_names.include?(method_name) && args.empty?
        color(method_name)
      else
        super
      end
    end
We take care of X11 color method call here.
 Such as #aqua, #ghostwhite.