Bento for a preschooler

Summer vacation is nearly over. My 4 y.o. daughter will be starting school again in less than a month, and I am considering making bento for her. In the previous schoolyear, she mostly had rice and chicken nuggets. I want her to try other stuff as well. I have a few ideas on what to put in her box: Small shaped onigiri Tamagoyaki Shaped hotdogs/sausages Cheese slices (cut with cookie cutters) Noodles with no sauce (she doesn't like sauce on her spaghetti for example) All of those above I have experience making. Do you have other ideas on what I can prepare? What do you prepare for your kids?