Apologies for the late response! I had started with making a collage of images, then did some color grading to make everything green-ish. Next I mapped it onto a cube, subdivided it a bunch and applied a displacement map of the same image, but in grey scale. I think I also plugged it into a principled BSDF node, and cranked the sheen / specular to make it shiny, as well as enabling freestyling in the render, to give it the black outlines.