You can add many different spices to your fermented green beans. Try adding dill (fresh or dry) to make your beans dilly beans. You can add any kind of pepper, fresh or dry, like cayenne or jalapeno if you want to add some heat, or chili flakes. You can add mixed pickling spice or peppercorns. Really, there are no ruls. You can add anything you want and try something a little different each time until you find your favorite combination.