Some other good, tasty, less used grains are millet, barley, rye, buckwheat, and teff. Also try some older forms of wheat like triticale as well. Go to a place with a good bulk foods section (whole foods is one) and take a sampling of several items to try. As far as smoothies go, you can still mix a protein powder with some sort of carb (oatmuscle from protein factory is one that is healthy and tasty) and and some sort of fat source for a complete and quick meal.