I actually looked around a while back, and searching for "spiky spheres" and the
like led me on a few interesting tangents, but I didn't find anything concrete.

All of the different "cartoon" models I've seen vary widely in appearance, so if
you're looking to do something like that, I'd say why not use one of the recent
golf ball models to locate some inverted cone shapes around a sphere and then
use a noisy sphere isosurface as the center, or a ton of spheres placed with

#include "rand.inc"
#declare Stream = seed (123);
#declare Variable = VRand_On_Sphere(Stream);

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The Korkin Lab put together some models of the coronavirus protein pieces:
https://www.biorxiv.org/content/10.1101/2020.02.10.942136v1.full.pdf

along with a 9.5 MB zip.  I know that some folks use POV-Ray to render protein
data bank files (pdb)...    I know, I know - orders of magnitude more
complicated than what you're looking for, but just posting for reference in case
someone ambitious wanted to investigate further.  ;)

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