What about dried herb mixtures for salad dressings? I make these for myself when I am out of frozen basil....people love my salad dressings. You can package them in little ziploc craft bags, like the heavier 2x3" bags, and tie a cute instruction card on with a bit of raffia, print the card out on a more "rustic" looking 65 lb paper and fold it in half, with a catchy name on the outside. Store and display them in large glass jars with tight-fitting lids so the flavors stay fresh and don't intermingle, and you can bring the same jars back week after week, rotating newer stock to the bottom of the jars. You could make these up with the rub mixtures and the bean soup spice mixture during the slow times of the year.
And I don't think anyone mentioned those cute layered mixes in canning jars for cakes and cookies and such that are more about the packaging....not sure if it is $ efficient, though.