I usually add herbs to this (which I never measure, but about 2 tsp total is pretty flavorful), and top with seeds. I've also substituted or added whole wheat flour(up to 2 cups), wheat and/or oat bran, cheese, oil, dried garlic and onions, even spinach powder (which turned the bread green; I thought it looked gross, but everybody else liked it.)

My favorite herb combo is dried, minced garlic (or garlic powder), dill weed, and dill seed.

I use a mix of seeds for the top, usually sesame, poppy, flax, and caraway. These would look nice in a bow-tied cellophane bag!