colors.js/lib/maps/random.js

module['exports'] = function(colors) {
  var available = ['underline', 'inverse', 'grey', 'yellow', 'red', 'green',
    'blue', 'white', 'cyan', 'magenta'];
  return function(letter, i, exploded) {
    return letter === ' ' ? letter :
      colors[
        available[Math.round(Math.random() * (available.length - 2))]
      ](letter);
  };
};