You can use both of those legumes in a tasty casserole dish - chop up some onions, garlic (if liked), celery, mushrooms, courgette, peppers etc and saut� until softened. Add your favourite spices (chilli, mustard seeds, etc) and a can of chopped tomatoes, plus a canful of water. Add some mixed herbs, half a teaspoon each of salt and sugar and cook for about 30 minutes. Open the cans of chickpeas and/or lentils, rinse the water off and then add them to the pot. Heat through and serve with cooked rice or soaked cracked wheat or even doorsteps of fresh white crusty bread.
Leftovers of this dish would also be good put into an ovenproof dish and topped with mashed potato (a sort of veggie shepherd's pie), possibly with some grated parmesan on top too.
You also add either or both of those cans (rinsed and drained) in a salad - shredded lettuce, chopped cucumber, finely chopped spring onion, cooked sweetcorn, cooked rice (cold), chopped pepper, celery and some french dressing.