After treating the students to a 'fractal zoom' (loads available on Youtube) we looked at the Koch Snowflake in more detail, discussing its structure and how it 'grew'. I then projected the instructions for folding the equilateral triangle (I used this resource from Arbelos; alternatively this excellent @MEImaths presentation shows it step-by-step) and let the students figure it out by themselves. Once they'd nailed the fold, I set them the challenge of using different A-sized paper to create their own fractal snowflakes. They did really well!
Fractal Christmas Tree
Fractal Christmas Cards