Koch Fractal Vase modeled in SolidWorks using 3 sketches and a thin-wall loft.
Axon 3 no longer allows for infill to be set to 0 so I set out to design a vase that would slice natively into a thin-wall structure. Not sure what settings you would want to use in Skeinforge but it should print fine as is.
EDIT: I have uploaded solid versions which might make slicing easier for some of you. Give it a shot if you were having trouble before and let me know if there are any other formats you would find useful.