TexturePaintを使って背景に画像を表示

BufferedImage bi;
try {
  bi = ImageIO.read(getClass().getResource("16x16.png"));
} catch (IOException ex) {
  ex.printStackTrace();
  bi = makeMissingImage();
}
texture = new TexturePaint(bi, new Rectangle(bi.getWidth(), bi.getHeight()));
panel = new JPanel() {
  @Override protected void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setPaint(texture);
    g2.fillRect(0, 0, getWidth(), getHeight());
    g2.dispose();
    super.paintComponent(g);
  }
}