A small bit I did for a modular grenade I had posted before. Essentially a booby trap that's got saliva activated glue at the bottom which expands if you spit on it.
It's all fully done in 3D Coat including render in Renderman.
I've talked about all steps of creation on my youtube channel. No need to subscribe (surprise!)
I used my 3d scans from here - https://www.fotoref.com/products/porous-limestone-cliffs-1#3d-scan
Also, you can get free decals that I used here - https://gumroad.com/products/CIUFZ