Does anyone have any ideas?

for my art cl we have to make a vessel form sculpture. meaning it has to be hollow, and open on any end. such as a bowl or an upside down ice cream cone. it can't be anything too hard, and not too time consuming, because it has to be done in a week. so does anyone have any ideas? please don't give me any simple things like a flower or a simple bowl or cup. i want something creative & unique. and it can't be anything with a lid like a teapot or something. please help because i need an idea by tomorrow.. thanks!! :]