How to Make Snowflakes Inside: In a wide mouth canning jar, add 3 Tbsp of borax per 2 cups of boiling water. stir to dissolve. Make a shape using a pipe cleaner, and hang it from a pencil suspended across the jar mouth using a piece of yarn (don't let it touch the bottom). Be sure water is high enough to cover. Leave overnight. Pull out & let dry. Once dry, carefully hang in window. *Do this for Southern Snow Day Activity if you live somewhere that it doesn't snow.