code: function(){
  		var r = 0,
  			g = 0,
  			b = 0,
  			a = 0;
  
  		this.each(function(c){
  			r += c.rgb[0];
  			g += c.rgb[1];
  			b += c.rgb[2];
  			a += c.alpha();
  		});
  
  		var num = this.colors.length;
  		if(num > 0){
  			return TColor.newRGBA(r / num, g / num, b / num, a / num);
  		}
  		return undefined;
  	}
docs: Calculates and returns the average color of the list.
  @return average color or null, if there're no entries yet.