Who doesn’t like using food for science? After completing a unit on insects, end with allowing students to make their own out of food products. Remind them that they should make their insect scientifically correct (3 body parts, 6 legs)—if you are using this as an assessment, you might not want to give too many details. Things to include for them to build with are

marshmallows
flat toothpicks and/or thin pretzel sticks
fruit rollups (good for wings)
raisins
various small candies, such as cinnamon hots or mini chocolate chips
frosting (acts as a glue—or you can have them coat their insect with it as an “exoskeleton”—pass out popsicle sticks to spread with)
If this sounds too messy, you can also have students create insects with recyclable odds and ends, such as empty egg cartons, film canisters, and water bottle lids.