This animation shows the steps the generator uses to combine the layers.
These images were a part of my GDC presentation 'Creating Photorealistic Procedural Materials with Substance Designer'. The medals themselves are used in a WW2 turn based strategy game called Day Of Victory, that me and some buddies are working on as a side project. More information available here:
http://www.dayofvictorygame.com
For this project, I only needed 3 win medals (gold, silver, bronze tier) and 1 lose medal per team (Germans/Soviets). Instead of brute forcing and creating these manually, I created this Medal Generator in Substance Designer that enables me to create hundreds of permutations without much effort.
First, you define the number of layers you want, then the shapes for each layer, and finally you define what colors & materials each layer should be (enamel, gold, etc).
The final game-ready assets are then rendered in Marmoset on a flat plane using displacement, tessellation and alpha.