I designed and printed this vase for valentine's day a few years ago. I printed with a 0.4mm nozzle at 0.2mm layer height: it's a long print that uses a lot of filament (310g), but looks great in dual color silk PLA. And it's water tight. Get started now and you'll have plenty of time to finish it in time for February the 14th ;-)
06 March 24 update: Added a solid version at the request of a commenter.
The author marked this model as their own original creation.