code: function(urlPath) {
      var declarations = '';
      if (!urlPath) urlPath = '';
      for (var color in this.colors) {
        declarations += this.cssName(color) + ' { background-image: url(' +
                        urlPath + this.filename(color) + ') }\n';
      }
      return declarations;
    }
docs: Returns CSS declaration(s) corresponding to the glyphs colors