I once made a little Whale out of Bluestone. Somebody bought it, liked and commissioned a huge one. It is installed so that the tide comes in every day and washes it.
This was a monumental task, five tons or so was carved down in unforgivingly hard Bluestone. Placed where it is and finished off in situ. I walk past it occasionally and its looks so good encrusted with barnacles and seaweed.