code: function(opt_randFunc) {
      var randFunc = opt_randFunc || randInt;
      var strong = randFunc(3);
      var colors = [];
      for (var ii = 0; ii < 3; ++ii) {
        colors.push(randFunc(128) + (ii === strong ? 128 : 64));
      }
      return "rgb(" + colors.join(",") + ")";
    }
docs: get a random CSS color
  @param {function(number): number?) opt_randFunc function to generate random numbers
  @return {string} random css color
  @memberOf module:Misc