Java Code:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.metal.MetalTabbedPaneUI;

/**
 * @version 1.0 08/23/99
 */
public class ColorTabbedPaneExample extends JFrame {

  String[] titles = { "blue", "cyan", "green", "yellow", "orange", "pink",
      "red" };

  Color[] colors = { Color.blue, Color.cyan, Color.green, Color.yellow,
      Color.orange, Color.pink, Color.red };

  JTabbedPane tabbedPane;

  public ColorTabbedPaneExample() {
    super("ColorTabbedPaneExample (Metal)");

    UIManager.put("TabbedPane.selected", colors[0]);
    tabbedPane = new JTabbedPane() {
      public void updateUI() {
        setUI(new ColoredTabbedPaneUI());
      }
    };
    for (int i = 0; i < titles.length; i++) {
      tabbedPane.addTab(titles[i], createPane(titles[i], colors[i]));
      tabbedPane.setBackgroundAt(i, colors[i].darker());
    }
    tabbedPane.setSelectedIndex(0);

    tabbedPane.addChangeListener(new ChangeListener() {
      public void stateChanged(ChangeEvent e) {
        int i = tabbedPane.getSelectedIndex();
        ((ColoredTabbedPaneUI) tabbedPane.getUI())
            .setSelectedTabBackground(colors[i]);
        tabbedPane.revalidate();
        tabbedPane.repaint();
      }
    });
    getContentPane().add(tabbedPane);
  }

  JPanel createPane(String title, Color color) {
    JPanel panel = new JPanel();
    panel.setBackground(color);
    JLabel label = new JLabel(title);
    label.setOpaque(true);
    label.setBackground(Color.white);
    panel.add(label);
    return panel;
  }

  class ColoredTabbedPaneUI extends MetalTabbedPaneUI {
    public void setSelectedTabBackground(Color color) {
      selectColor = color;
    }

    protected void paintFocusIndicator(Graphics g, int tabPlacement,
        Rectangle[] rects, int tabIndex, Rectangle iconRect,
        Rectangle textRect, boolean isSelected) {
    }
  }

  public static void main(String[] args) {
    JFrame frame = new ColorTabbedPaneExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(360, 100);
    frame.setVisible(true);
  }
}