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Ice vase - Feb 2002
Ice vase - Jan 2004
Ice tower - Mar 2004
Ice pegs - 2007-8
Ice spike - Jan 2008
Ice spike - Dec 2008
Ice spikes - Dec 2008
Ice spikes - Feb 2009
Ice needle - Feb 2009
Ice triangles
Ice hair - Jan 2005
Brian Maginn's ice spike
Jon Nelson's ice vase
Stefan's 150mm ice spike
For more information see:
SnowCrystals.com
and
Ice spikes
also
Scientific American
Create ice spikes
Icicles in reverse
Jon Nelson's ice vase, 25th January 2009
He thought that the temperature was around -4 C when it formed.
Many thanks to Jon for allowing me to reproduce this picture.