Remember MTV's infamous spiky rubber couch ?

As a mesh, the material would be very high-poly and, limited to that object, so not 'portable'...

I must have made a dozen tries at replicating this look with a bump / displacement map, failed...

My attempts ran the gamut from bumpy 'starfish' through 'sorta-sea-urchin' to stegosaur, but nothing came close...

Free-stuff would be nice, but I'd happily grab from Marketplace.