deviantARTist Thom-Heap built this gruesomely awesome sculpture of a Dementor, named "LongClaw" from papier-mâché as a prop for Harry Potter convention MISTI-Con in New Hampshire next year. She's quite talented!
Image: Dementor LongClaw - via MISTI-Con
Image: Dementor without shroud - via deviantART
Image: Dementor Sculpture (with shroud) - via deviantART
Image: Thom-Heap as Severus Snape fighting a Dementor in her back yard - via deviantART