Here is a painting technique where the object that is represented (the snowflake) appears because it is not painted.
Tracing the lines of the snowflake is a good pre-writing exercise.
PDF file (4 pages)
The downloadable document contains the list of materials, illustrated instructions, one snowflake template, and sample pictures.
This is a free document.
These snowflakes are ready to be painted with glue, or to be used as pre-writing exercises.
PDF file (20 pages)