# File lib/gruff/base.rb, line 895
    def render_background
      case @theme_options[:background_colors]
      when Array
        @base_image = render_gradiated_background(*@theme_options[:background_colors])
      when String
        @base_image = render_solid_background(@theme_options[:background_colors])
      else
        @base_image = render_image_background(*@theme_options[:background_image])
      end
    end