From the Boing Boing DIY costume thread, an anonymous reader says, "For halloween last year we were in black and white (grayscale).
Silent Film star; 1920s black and white and carry around those little dialogue signs, too.
Awesome grayscale costumes. My mind is blown right now
How to go grayscale for Halloween. Black and white make-up tutorial. B&W costume instructions. By Whitney Avalon.
Halloween Costume 2012: Fifty Shades of Grey (grayscale costume ...
DIY Halloween: Film Noir Grayscale Costume
Black & White Movie costume! Grayscale costume! Halloween costume! #blackandwhitemovie #couplecostume #grayscale #grayscalecostume #1940s #1940scostume #oldmovie #halloween
Black and White 40's Glamour Makeup Tutorial
Silent movie make up