This also works as fallen snow. To make it more fancy, combine 4 cups (960mL) flakes, 1⅓ cup (320mL) liquid starch, several drops blue food coloring, and glitter.
This may look more realistic if you put it in the freezer. If it dries out, just add more water. If you want to keep it dry, reduce the amount of water and add salt.
Don’t use a nice new brush, since rubbing the bristles will damage them.