This is wall made with skulls that I did recently as challenge/showcase. Goal here to use 3d object in the Substance Designer.
1st i searched for skull model to use for the graph.
https://skfb.ly/CIF8 - I used this skull photo scan by sketchfab user Kantemrati.
2nd I loaded this skull in Blender and rendered it with generated gradient texture in a Z axis. Basically depth information.
Then I put Displace on box to show it here.