Graphics2D g2d = bi.createGraphics();
g2d.setColor(Color.RED);
g2d.fillRect(0,0,100,100);

BufferedImage bi;
Graphics2D g2d = bi.createGraphics();
g2d.setPaint (new Color(r, g, b));
g2d.fillRect (0, 0, bi.getWidth(), bi.getHeight());

TexturePaint tp = new TexturePaint(myImage, new Rectangle(0, 0, 16, 16));

g2d.setPaint(tp);

public class TexturePanel extends JPanel {

    private TexturePaint paint;

    public TexturePanel(BufferedImage bi) {
        super();
        this.paint = new TexturePaint(bi, new Rectangle(0, 0, bi.getWidth(), bi.getHeight()));
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setPaint(paint);
        g2.fill(new Rectangle(0, 0, getWidth(), getHeight()));
    }
}