Well DD's packed lunches are legendary for their weirdness so I on't know if my suggestions will help!
DD doesn't like bread so we use cold pasta/cous-cous/rice for a base and then add in something like smoked salmon, prawns, left over meat (e.g. lamb or duck if we've roasted the night before), whatever cheese we've got, salami, chorizo and so on. In the same tub we put veg, always carrots and peppers as DD adores those, peas, sweetcorn, celery, cucumber, tomatoes anything goes really.
She then has a yoghurt, individual jelly, cake (if i've baked) for pudding. School provides fruit at morning and afternoon break so don't feel the need to put that in. They also provide water for lunch so no need for a drink.
DD also has a snack for after care, say a tub of pistachios, sesame snaps or raisins. Again they provide water so need for a drink.
All these weird and wonderful things just get put in tubs in DD's lunchbox (actually a small nylon rucksack) we've never had any illness.