I went ahead and turned the "worst" part of a hickory board. I love the way it looks, but the knot hole goes all the way through the base of the cup. So I think I have 3 equally good choices and would like other people's artistic opinion.
1) Leave it and have an ornamental piece.
2) Fill the gap with epoxy and turquoise.
3) Fill the gap and fill with epoxy and coffee grounds.
What is your opinion (or other suggestion?)