synth

You can override createArrowButton() in BasicComboBoxUI. BasicArrowButton is a convenient starting point. class ColorArrowUI extends BasicComboBoxUI { public static ComboBoxUI createUI(JComponent c) { return new ColorArrowUI(); } @Override protected JButton createArrowButton() { return new BasicArrowButton( BasicArrowButton.SOUTH, Color.cyan, Color.magenta, Color.yellow, Color.blue); } } Then install it. JComboBox combo = new JComboBox(); combo.setUI(ColorArrowUI.createUI(combo));