I use nori sheets to make my own roasted seaweed snacks. They kiddos love them. I make sunbutter from roasted sunflower seed kernels (we're a nut-free classroom) and I'll pack it with apple slices or on celery sticks.
Another fun food takes a bit of time but hardly any work. I'll pickle beets or make sauerkraut with red cabbage. Once the beets or sauerkraut is gone I'll plop peeled hard boiled eggs into the remaining liquid. The beet juice tuns the eggs hot pink while the red cabbage sauerkraut turns them deep blue. The kids think they're very fun, and it's nice to dye food without all the nasty fake stuff.
Making homemade "Lara Bars" is easy and tasty. My usual recipe: 1/2 C + 1 T nuts (almonds, sunflower seeds, brazil nuts, hazelnuts, shelled pumpkin seeds, etc.), 1/2 C dried fruit (dates, apple rings, figs, dehydrated bananas (not the chips), dried blueberries, etc.), cinnamon or cocoa powder, and a small carrot.
Grind the nuts in a food processor until a coarse powder. Add fruit, cinnamon or cocoa powder, and the carrot, chopped. Process until it starts clumping. Form into balls. Roll in chia seeds or hemp hearts if desired.
Of course: cherry tomatoes, berries, plums, fresh green beans, avocado halves, bananas, grapes, orange segments, cucumber slices, olives, etc.