Preheat oven to 225°F (110°C). Line 2 baking sheets with parchment paper.
Beat the egg whites, cream of tartar, and salt with a mixer until soft peaks form.
Gradually add the sugar, a spoonful at a time, beating until stiff, glossy peaks form. Beat in the vanilla.
Transfer to a piping bag fitted with a large round tip (or a zip-top bag with the corner snipped). Pipe tall swirled mounds onto the baking sheets — these are your ghost bodies!
Bake for 1 1/2 hours, until dry and firm. Turn off the oven and let them cool inside for 1 hour.
Press 2 candy eyes onto each ghost while they're still slightly soft (or attach with a tiny dab of melted chocolate).