The pattern can be found in some old Finnish books. I don't know if it is available in English. The instructions even in Finnish are not very exact, they show you the pattern and how to arrange the little balls but so far I haven't seen anywhere explained how the stitch is made.
We had -14 degrees today, the sun was shining and I had to go out to take you a picture of the frozen lake. I found these frost flowers scattered all around the ice. Then happened to look at the gloves I was wearing ... the same flower!
These gloves are "Vante from Hedmark" from the book "Håndplagg til Bunader og Folkedrakter" (ISBN-82-496-0187-4). It is the most beautiful Norwegian book about hand wear.
The whole lake is frozen! The ice is maybe 3 cm (little more than 1 inch) thick, I walked on it near the shore and jumped on it and it feels quite strong already. We might be able to skate later on this week if the weather stays like this.