Pinto beans and rice ok. Next month or in the future diversify your legumes ( esp add lentils). So, for only pinto beans and rice:
Chili : pinto beans (half cooked beans left whole, half mashed with potato masher) suated chopped onions, some kind of tomato product (1/2 can tomato paste, or canned tomatoes or whatever you get on sale) salt, chili powder, cumin. I like to add a small amount of corn kernals ( frozen, save the rest of the bag for another day, or 1/2 a can and freeze teh other half can
Serve over rice
Minestrone soup: saute chopped onion. add other veggies, like sliced carrots, celery or zuchini, parsley, a LOT of garlic, whole cloves, dried, powdered, whatever you have, 5 or 6 cloves, tomato product, I can diced or 1/2 can tomato paste, etc... Water (dont need broth) leftover cooked pinto beans and rice. Spices are Salt, pepper, oregano, basil (all dried is great) Or, look up a recipe and just substitute that you are using pinto beans intead of kidny or garbanzo, and leftover rice instead of noodles. I do this all the time, tastes great.
Tamale pie: Leftover chili topped with a corn product, like cooked polenta or corn bread batter, bake in the oven
Baked beans: any recipe, this works with pintos sub'd for white beans just fine. Needs onion, salt, mustard powder, molasses or sugar. Serve over rice