These ice flowers form at the boundary between cold, dry air and the salty ocean--and they may increase in abundance as the poles warm. Read about them in
NPR's radiolab piece: "Suddenly There's A Meadow In The Ocean With 'Flowers' Everywhere"
by Robert Krulwich, December 19, 2012
with clarification and more information on Jeff Bowman's blog (UW Biological Oceanography):