# File lib/gruff/base.rb, line 424
    def theme_greyscale
      # Colors
      @colors = [
                 '#282828', #
                 '#383838', #
                 '#686868', #
                 '#989898', #
                 '#c8c8c8', #
                 '#e8e8e8', #
                ]

      self.theme = {
        :colors => @colors,
        :marker_color => '#aea9a9', # Grey
        :font_color => 'black',
        :background_colors => 'white'
      }
    end