Quinoa: It is actually a seed rather than a traditional grain, but it is prepared and eaten as a grain. Quercetin is an anti-oxidant in quinoa that improves the immune system and can help with allergies. It is also a gluten-free side that also has a ton of protein. Because quinoa has no gluten and is not a typical grain, it has a low glycemic index and will not increase your insulin as dramatically as does rice and breads. In my opinion, the best way to cook quinoa is to boil it in stock (vegetable, beef, or chicken work best). Once cooked, you can treat it like rice and enjoy it in many meals! Think fried rice, taco salads, sweet quinoa salads.
Millet: It is also a seed grain and looks like a small couscous and is delicious! Millet is very high in fiber and even acts as a probiotic for some of the normal flora in your intestines. It is also high in magnesium and niacin which are good for your heart. Millet is also gluten-free and high in protein.
Wild rice: Not only is wild rice tasty with a great texture, it is also lower in calories than other varieties of rice. It is very high in natural antioxidants and can improve your immune system. Not to mention it is great in soup!