Plants and animals use different network geometries on the nanoscale to reflect specific wavelengths, leading to structural colour. The structural colour produced by chitonous ordered 3D structures such as the diamond and the gyroid in butterflies and beetles is well understood. This project aims to establish a relationship between the structural parameters and the optical response for disordered networks, which are found in various insects. For this, we computer-generate a population of random networks with a Metropolis Monte-Carlo approach. These networks are subsequently analysed using various statistical metrics and optical simulations. The goal is to predict and understand the emergence of a photonic band gap – the frequency range of reflected wavelengths – from the structural properties.