Pen blanks from man made material can make interesting pens.
Certainly people seem to like them.
But it'll never replace wood, as far as enjoying the process of turning goes.
The reddish brown one, all by itself, is red gum.
The ramblings of a bloke whose mid-life crisis has taken the form, not of little red sports cars and buxom blondes, but of trying to make musical instruments, particularly those of another era. For a man without a musical bone in his body, this may seem strange. C'est la vie.