For this O2 advert butterflies are dispensed from cash machines with wings made from money.  I started with building the 3D model based around the blue morpho butterfly.  They shot some real butterflies on set for reference so initially I setup the shaders and textures of the 3d wings to match these and then changed the textures  to look like 5 pound notes.  The wings required  multiple texture maps including diffuse colour, specular weight, specular roughness, specular colour, brdf, transparency and SSS.

Various texture maps created for the shading of the butterfly wings