The first set of materials that I wanted to make on my own in Substance Designer had a bit of an alien theme going on. This one was a mix of a beehive and some sort of scifi growth chamber. Fun material to make, but the vines/veins took a bit to get right.
You can find the SBSAR on Gumroad here: https://dctech.gumroad.com
Or on ArtStation: https://www.artstation.com/undertow/store