The NanoCell2SEC project aimed to create a platform of counterfeit-deterrence solutions derived from cellulose nanocrystals composites’ structural colour. These were fabricated from sustainable and cost-effective natural materials as cellulosic derivatives and were inspired by the reflection naturally observed in insects. In the appropriate conditions, these systems originate liquid crystalline phases that can be fixed in matrices upon solvent evaporation or evolve with time, giving rise to structures with structural colouration. The iridescent structures (overt response) with selective circularly light reflection (covert response) allow an easy and effective security verification mechanism. Furthermore, active elements award increased security levels. The search for new insect biomimetic photonic structures contributes to a better understanding of their optical responses.