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Snowflake Holiday Ornament
Kenneth G. Libbrecht, from Caltech has some gorgeous microphotos of snowflakes at http://SnowCrystals.com. I took one of his images, removed the background, and then made it into a height map using cura's photo import.
I set the background depth to 0, but you still get one layer, so print with a .1 cutoff, or edit in netfabb or meshmixer.
The ornament version was combined with a ring I made in openscad (trivial, so I only posted the stl here) in Meshmixer.