Photonic crystals can be sources of brilliant reflected colors arising from Bragg’s optical diffraction. A variety of methods have been developed to create photonic crystals. However, most of current technologies are only favorable for laboratory-scale production. This presentation reviews three scalable coating technologies for assembling highly ordered colloidal crystal-polymer composites, colloidal crystals, and macroporous polymer membranes. The applications, including antireflection coatings, vapor detection, superhydrophobic coatings, are also introduced.