Did this piece for my 100 Days of Neon in 2021.
Although I love how it turned out (bottom piece, orig.), it looked rather plain to me, so I made it into a collage:
ok, technically not a folded pen, however, there are so many fun ways to use and manipulate this tool, that some of the results look as though a folded pen was used.
Was doing a lettering piece with dual ink and had leftover.