An ant script saved from https://github.com/jywarren/antfarm

ant.js

onRun = function() {

  this.direction += Math.random()*10-5;
  field.trail(this.x, this.y, 'blue', 50); // x, y, rgb, amount

}

onBump = function() {

  this.direction += 90;

}