For an exotic change of pace, you may want to try grinding different flavors into your coffee. Chicory is a well known coffee substitute and additive; popular in the south. Chicory is a root and it's greens are sometimes used in salads. The root part of the plant is roasted and ground; it's color resembles that of ground coffee. If you feel like experimenting use about one part chicory to four parts coffee.

Some other flavors that go well with coffee are cinnamon, nutmeg, vanilla and cocoa.
With ground spices, add a healthy dash and grind as you normally would. With  cocoa, you can buy the beans whole, then grind in a teaspoon of  beans per pot for a light touch of flavor.
Vanilla beans come in a long pod. Open the pod and scrape out a half  to one inch per pot.