Frugal, portable lunch box ideas

We're barely two months into school and I'm already in a rut when it comes to packing my daughter's lunches for school.

Let's see. We have ham and cheese sandwiches, cheese sandwiches, hummus and crackers, hard boiled eggs, cheese sticks and yogurt with granola and fruit. And then we start all over again. At least I'm able to mix it up a bit when it comes to the sides ... fruits, veggies, granola bars, crackers, trail mix and the occasional dark chocolate (when I want to open a bar but don't want to eat all of it).

Still, I need ideas.