Flicker flicker!

[angel_eyez]

//christmas tree
window.setColor(Color.green);
int[] tCoordinates = {210, 190, 200, 189, 195, 185, 175, 180, 165, 175, 155};
int[] sCoordinates = {230, 210, 210, 195, 195, 185, 195, 195, 210, 210, 230};
window.fillPolygon(tCoordinates, sCoordinates, tCoordinates.length);

Color newColor1 = new Color(88,58,31);
window.setColor(newColor1);
window.fillRect(173, 230, 15, 27);

//christmas tree ornaments
window.setColor(Color.red);
window.fillOval(178, 200, 07, 05);

Color newColor2 = new Color(15,89,4);
window.setColor(newColor2);
window.fillOval(181, 210, 07, 05);


window.setColor(Color.red);
window.fillOval(184, 220, 07, 05);



How do I make the ornaments flicker a different color? (red, green, blue, yellow, etc. [animation]) Using Thread.sleep?

[hardwired]

Code:

import java.awt.*;
import java.util.Random;
import javax.swing.*;

public class FlickerTest extends JPanel implements Runnable {
    int[] tCoordinates = {
        210, 190, 200, 189, 195, 185, 175, 180, 165, 175, 155
    };
    int[] sCoordinates = {
        230, 210, 210, 195, 195, 185, 195, 195, 210, 210, 230
    };
    Color[] colors = {
        Color.red, Color.orange, Color.blue, Color.yellow,
        new Color(15,89,4)
    };
    Random seed = new Random();
    int[] indices = { 1, 2, 3 };

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.green);
        g2.fillPolygon(tCoordinates, sCoordinates, tCoordinates.length);

        g2.setColor(new Color(88,58,31));
        g2.fillRect(173, 230, 15, 27);

        //christmas tree ornaments
        g2.setColor(colors[indices[0]]);
        g2.fillOval(178, 200, 07, 05);

        g2.setColor(colors[indices[1]]);
        g2.fillOval(181, 210, 07, 05);

        g2.setColor(colors[indices[2]]);
        g2.fillOval(184, 220, 07, 05);
    }

    private void updateIndices() {
        for(int j = 0; j < indices.length; j++) {
            int index = indices[j];
            do {
                index = seed.nextInt(colors.length);
            } while(index == indices[j]);
            indices[j] = index;
        }
    }

    private void start() {
        new Thread(this).start();
    }

    public void run() {
        boolean flickering = true;
        while(flickering) {
            try {
                Thread.sleep(1000);
            } catch(InterruptedException e) {
                flickering = false;
            }
            updateIndices();
            repaint();
        }
    }

    public static void main(String[] args) {
        FlickerTest test = new FlickerTest();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        test.start();
    }
}