Background

gistfile1.as

package
{
	import flash.display.GradientType;
	import flash.display.Sprite;
	import flash.events.Event;
	
	public class Background extends Sprite
	{
		public function Background()
		{
			addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		public function init(e:Event):void
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
			
			drawMe();
		}
		
		public function drawMe():void
		{
			this.graphics.beginGradientFill(GradientType.RADIAL,[Math.random()*0xffffff,Math.random()*0xffffff],[0,1],[0,25]);
			this.graphics.drawRect(0, 0, 800, 600);
			this.graphics.endFill();
		}
	}
}