Read the Caldecott-winning book Snowflake Bentley by Jacqueline Briggs Martin. Discuss the difficulty in capturing snowflakes and the contributions Wilson Bentley made to the understanding of snowflakes. There are some of Bentley's photographs in the book and you can find more online.
2 Direct Instruction
Watch the BrainPOP video on snowflakes to learn about how snowflakes are formed and how weather and other conditions affect their shape.
3 Design Part 1
Using paper and pencil, students will sketch a rough idea of what their snowflake will look like. Student must consider if their snowflake was formed in dry/wet conditions, hot/cold conditions, etc. as they plan the design.
4 Design Part 2
Using 3D modeling software, students will create a 3D model of their snowflake. If students have never used 3D modeling software, you will need teach this skill first. With my students, I use 123D Design on iPads and Tinkercad on computers (depending on which the students have access to).
If you have access to a 3D printer, print their snowflakes. (I found 2-3 mm to be the ideal thickness.) A little fishing line helps make a magical display. If you can't 3D print the snowflakes, print the images on paper or post the 3D models online. Give students the opportunity to share their snowflakes with others. If you have a class blog or class social media account, share the project with others. Everyone loves snowflakes.