So you are looking for a simple tool to help you crack nuts in a less messy fashion? The MENU Nut Hammer might help. It has a dark wooden shaft and a cast iron top. The Nut Hammer is easy to use. Just put a nut inside the silicone holder, hit the hammer against a hard surface, and you are set. You do want to make sure you use the Nut Hammer on surfaces that are tough enough not to get damaged by the blow.
The Nut Hammer has a cup that keeps all the pieces together as you crack a nut. The above video shows how this device works.