Several years ago our President's Challenge was: most unusual material. So
I turned a dish out of a bar of soap (called it a soap dish,) a bowl out of
a hard French roll (called it a bread bowl,} a bowl in the pages of a book
(titled it "turning pages,") turned a candle to look like a candlestick.

I have watched a demonstration by an ice sculptor, who worked with a
chainsaw, so I assume it would not be too difficult to turn ice in a lathe.
Be prepared to deal with the rusting problem.