Answer:
Mitochondria
Hydraulic Dams
Ribosomes
Small Shops
Nucleus
Town Hall
Endoplasmic Reticulum
Railroad Tracks
Golgi Bodies
Post Office
Cytoplasm
Clean Air and Water
Protein
Widget
Cell Membrane
Fence
Lysosomes
Scrap Yard
Nucleolus
Carpenter's Union
Vacoule
Warehouse
here is some ideas