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Picture of Unbalanced Vase
This unbalanced vase (weight inserted in the base) is a 3d print of a freeform drawing.

The 3d printing and design files are available at:

http://www.thingiverse.com/thing:24280

Step 1:

Picture of
I drew a 100mm by 125mm box on a sheet of paper (within the buildable limits of my MakerBot Replicator) and drew a vase. I marked dots at points that would sort of define the curves.  I measured the x,y coordinates of each dot (lower left corner is 0,0--upper right is 100,125).