A really good and easy ice cream cake is made by layering ice cream sandwiches with cool whip and crushed Oreos. Start with a layer of sandwiches placed side by side. Spread a mixture of cool whip and crushed Oreos over this. You can also add some chocolate pudding to this layer as well. Do another top layer of ice cream sandwiches, ending with the cool whip/pudding mixture. Sprinkle with crushed Oreos.