This stalagmite like icicle formed itself in the bird's water bowl overnight on 17th-18th December (dundee). There were no drips to cause it to grow.

I took the attached photos  at Totnes (South West England) rowing club early one morning a couple of weeks ago when the temperature was below freezing.  The icicles originate from the weep holes of the uprights supporting the spiral staircase handrail which is on a very exposed corner of the building. The icicles are formed horizontally and each spiral is about 10mm thick, 400-500mm long and 200 deep. They have been seen before, so it was not a one off. Note that they grow in opposite directions.