Nintendo Mario Kart 14 inch Blue Shell Decorative Pillow Plush - New. Famous Blue Shell pillow from Mario Kart game Great spike detail! Perfect addition to any bedroom or game room Super soft Race to first place! Anyone who plays Mario Kart knows how important the blue shell is. Now it is time to bring the blue shell into your home. Your Nintendo loving little one will love this super soft and detailed pillow. This pillow is certain to become a favorite bedroom accessory.