Facial appliances, or prosthetics as they're more commonly known, are a fun and (relatively) easy way to add a fantastically realistic detail to your Halloween costume, and they range from a subtle addition to a visually striking overhaul of your entire face.
Etsy seller Cottage Emporium has a wide selection of fantasy inspired facial appliances, from a witch's nose to big dwarfen ears, devil horns and half face covers that make you look like a monkey or big cat.
With some spirit gum, a splash of color and a bit of practice you can take your Halloween costume from ordinary to most extraordinary with a little help from a special effects prosthetic!
Update- a reader named nihil pointed out that a product called Ben Nye Prosthetic Adhesive works much better than spirit gum, so you may want to look into this product instead. Thanks nihil!