Drawing with quills
I do drawings with quills sometimes, and several years ago I produced a set of drawings of birds and animals drawn with their quills: a picture of a turkey drawn with a turkey quill, a vulture with a vulture quill, and so on. ‘The porcupine’ was the most unusual one of the set! Possibly the strangest thing I’ve used is a plastic toothpick (which I used to draw an illustration for the cover of ‘Punch’ in 1957) but it achieved the effect I wanted.