A simple way to make easy snowflake art with paint and paper. Blend several shades of blue on watercolor paper and add paper punch snowflakes.
I know this isn't a Nativity, but I wonder if this concept would work for one - I love the items stuck in the top - a star and an angel would be just right up there.
Christmas Yarn Art Kid’s Craft (Lia Griffith)
Winter Watercolor Resist Art with Free Printable Snowflake Template from Fun at Home with Kids