Mac n' cheese with a couple hotdogs cut up into it, and some bbq sauce. Ramen noodles in a pot with assorted frozen veggies (the hotdog trick works here too).
Rice and beans: two cups rice, 4 cups water, two cans of beans, a chopped onion, a couple chopped carrots, salt, garlic, ginger, cayenne pepper. Any kind of canned beans will work; red, pinto, black, kidney, great northern, garbanzo. Mix the bean types together, and play with the seasonings to get some variety for the tongue.
Also, a grain plus a legume (thats any kind of bean, pea, or lentil) equals a complete protein. Rice and beans; barley and lentils; rice and lentils; couscous (made from wheat) and peas....you get the idea.
The same group of veggies can seem completely different if you cut them, or leave them whole, or use different spices.
Play with your food!