If I'm packing lunch, I take the ziploc or gladware containers and fill them with leftovers from dinner last night, normally brown rice or ww couscous with the entree if that's how it was served...
peanut butter and maple syrup sammies
avocado, tomato and cucumber
whip up extra firm silken tofu with some sundried tomato, a bit of olive oil, basil and a dash of salt and pepper and use it like cream cheese, you can do the same with mixed veggies and garlic too
wraps on tortillas with hummus, shredded carrots, cucumber, spinach
wraps with peanut butter, banana, shredded apple, raisins, and a drizzle of molasses