Have the child fold the paper in half vertically (independently or with assistance). Ask the child to draw any half-shape to be the base of the snowflake(i.e. half circle, half diamond, etc.). Instruct the child to draw more geometrical shapes along the edges of the paper, which can be cut out. Once the child is done drawing, let the child cut out all the shapes.
Let the child unfold the snowflake and decorate using crayons, markers, glitter, dot paint, stickers, etc.
To grade this activity you can:
1. Have lower/younger kids just cut out the big shape and then color in shapes that you draw for them (or you can draw and they can trace) if cutting the small shapes is too difficult
2. To make this activity easier you can also do half sheets of paper to make smaller snowflakes, less to color/cut/fold.
3. Have older/higher kids try to cut out shapes without drawing them first if they can. They can also fold the snowflake in half a second time (so it is in quarters) and do more cutouts on the snowflake.