Use hollowed-out red cabbage as bowl to hold dip. Cut off small amount of cabbage on bottom to make a flat surface and keeps it from wobbling. Set cabbage in center of large tray or plate. Fill with spinach dip; sour cream stirred vigorously with thawed package of frozen spinach. Surround cabbage with colorful sections of fresh vegetables, carrot sticks, fresh mushrooms, broccoli florets, cauliflower florets, etc.