Snow Day #2 ...and another pattern problem!

Last Tuesday's snow day was mild in comparison to this morning. As you can tell from above, this is what I woke up to and how the drive in to the school went.
Last night I saw a tweet where a Toronto teacher uploaded a video on youtube about a patterning challenge involving snow. The 7 of us who did make it into class today took up the challenge, and here is the result of our work.