The usual pipeline - browsing for cool images on Pinterest, finding an interesting one (https://cdna.artstation.com/p/assets/images/images/013/634/856/large/robert-w-c72b2b0457f32e493560f7eed62a55e0.jpg?1540496955) and trying to reproduce it in Substance Designer. This one I liked for its vibrant color combination.
100% procedural, done in Substance Designer, rendered in Marmoset.