How can I customise my shooting game with several different 'movieclips' that act as the bullets - AS 3.0

So I have a very simple shooting game. Right now I have gotten it to shoot with no problem. But what I want to do is randomise the bullet so that it will shoot out different colour bullets that I have created also as movieclips.

The code I have for shooting the same bullet is:

var bulletTimer:Timer = new Timer(200);

bulletTimer.addEventListener(TimerEvent.TIMER, timerListener);

function timerListener(e:TimerEvent):void

{

  //In the Library linkage for a movieclip should be Bullet

  var tempbullet:MovieClip = new bullet();

  //Place the bullet at the tip of the player's gun

  tempBullet.x = player.x +(player.width/2);

  tempBullet.y = player.y;

  tempBullet.cacheAsBitmap = true;

  tempBullet.speed = 10;

  Bullet.push(tempBullet);

  bulletSound.play(); //Play sound

  addChild(tempBullet);

}