What a great fold! I discovered it through a thread in the General Stamping forum. I even made the slimline card suggested with the extra cardstock (that's in my gallery here, too). I wrapped the Metallic Mesh Ribbon around the card to hold the folds closed.
There are so many little techniques on this card, all quite easy, but together they add some wow. My favorite - stamping the sentiment on damp Whisper White cardstock that's been washed with watered-down Memento Tuxedo Black ink. The dampness causes the ink to bleed a bit for an extra spooky look (I learned that from Elizabeth Price of Seeing InkSpots).