These images resemble the ones about the Lake Geneva (you can see here) but in this case the reason for these strange icy shapes is not the water spray from the lake but the Ontika waterfall, the tallest waterfall in Estonia.
If you're curious to see the staircase of the last picture during the summer..here it is:
http://seawayblog.blogspot.com/2008/03/when-ontika-fall-freezes.html?showComment=1256941347551#c4173984444512361730'> October 30, 2009 at 11:22 PM
Beautiful and interesting pictures.