Whip topping until in doubles in volume. In another bowl, whip egg whites. Fold egg whites into whipped topping. Fold in yolks. Divide whipped mixture in half. Place dark chocolate chips in microwave-safe bowl and heat until melted. Add dark melted chocolate to 1/2 of whipped mixture. Melt white chocolate and add to the other 1/2 of whipped mixture. Place in decorative serving dish and alternate layers of white/dark chocolate. Freeze. Take out of freezer 20 minute before serving.