I tried to figure out how to manually build low poly objects in Fusion 360 in the last days.
Most likely there are better suited applications out there.
But well, at least it worked and I learned something. 

Maybe someone out there is eagerly waiting for even more vase designs to print.

There's a model file for each vase as an object with a shell thickness of 2mm, and a solid version for printing in vase mode.