Scrimshaw, the etching or carving of bone, tooth , shell, or ivory (ivory may be illegal unless obtained before the laws were passed)
Usually done by sailors (1800's) on long voyages to pass the time.
Step 1: Get some Scrimshaw stuff to etch or carve
You will need something to etch or carve. Usually, shell, bone, antler, or ivory. I have tried, bone ,antler, teeth, ivory, polymer (ivory simulation), shell and glass! I found an old piano that had real Ivory keys. What a find! Then I found some keys that look exactly like the Ivory ones, but they were polymer plastic look- alikes. You can test for real ivory by heating a needle, held with plyers till red hot on the end. Touch to the key and if it goes into it easily its plastic, the Ivory will not puncture or melt like the plastic ones. Also grind and edge, one will smell like plastic and the other won't.