For me it's about bamboo endgrain hand engraving and monoprinting onto paper and other surfaces - would work on a pen barrel. You could cut and dry the bamboo ends, then glue them up to make the engraving surface.
Thomas Bewick (England, 1753-1828) was the master endgrain engraver who inspired me - great bio written by Jenny Uglow in 2006:
Nature's Engraver: A Life of Thomas Bewick.
I hand engraved this crane monoblock (flipping brain horizontally to reverse the image) on an inexpensive bamboo endgrain 6x6" chopping block after brushing on some India ink (using engraver Steve Lindsay's point geometry); then burnished a print onto paper and hand colored it with raw pigment and paint - block holding up well after many prints. It sounds complicated, but it's fun and can be as abstract as you like.
Bamboo is great stuff.
Your post inspires me to do some mini endgrain work in the direction of pen-making - thanks!
Best regards, Bob