I love The Nightmare Before Christmas and I love the spider snowflake Jack Skellington made accidentally. So I made it purposefully. It is very easy.
Just print off the attached document, cut off the bottom portion marked with the dotted line, fold in half, and cut. Make sure you are careful with the legs; they're skinny! To cut between the legs, just bend the paper slightly without creasing, and make a slit, then stick the scissors in the cut and carefully cut along the black lines.
Isn't it awesome!