Take a can of mixed beans and rinse thoroughly. Mix with diced onions and (optionally) cooked, cold green beans. Make a dressing of vinegar, sugar, salad oil and celery seed and marinate over night. It keeps well, too.
Greek style salads - chunks of tomato, cucumber, onion and feta cheese with a dressing of lemon juice, olive oil and oregano. There are lots of variations on this - try different vegetables (green and red pepper, green onion, broccoli, carrots, celery, cauliflower, daikon, etc), change the cheese, mix in fresh herbs, etc.
Tatziki or hummus or baba ganoj and veggies.
Hummus or baba ganoj and diced chicken in a half pita, with some lettuce or cucumer - some starch, but not a whole lot, and easy to eat.
A thermos full of soup - I like pureed vegetable soups. Start with chicken stock, add vegetables, cook until the veggies are soft, add seasonings (salt, pepper, herbs, lemon juice) and then dump in the blender. Delicious, cheap, good for you, and reheats well. Combos I use are (Potato, carrot, onion and garlic) (Asparagus), (Squash, onion and roasted red pepper with cumin and coriander) (Cucumber + Dill + Lemon). Recipes often involved adding cream - I actually like it better without it, as the flavours are more intense.