Two paper stars are needed to make one 3-dimensional star. Draw two identical stars on a piece of stiff paper like below
1. Decorate the two stars (if you like) on both sides, then cut them out.
2. Make one slit in each star. On one star, the slit goes from an inner corner to the center point of the star; on the other star, the slit goes from an outer corner to the center point. (see the image above)
3. Slip the two stars together through the slits you just cut. For stability, you may have to tape the stars a bit where they meet at the slits.
4. You now have a great three-dimensional star decoration that stands by itself on a table.
Source
1. Decorate the two stars (if you like) on both sides, then cut them out.
2. Make one slit in each star. On one star, the slit goes from an inner corner to the center point of the star; on the other star, the slit goes from an outer corner to the center point. (see the image above)
3. Slip the two stars together through the slits you just cut. For stability, you may have to tape the stars a bit where they meet at the slits.
4. You now have a great three-dimensional star decoration that stands by itself on a table.
Source