Old doll heads & toy skeleton hands in jars filled with green water. Creepy Halloween party decor + don't forget to add a waterproof LED light to make it glow, EXTRA haunting OMG: http://www.flashingblinkylights.com/ledsubmersiblecraftlights-c-114_462.html
Maybe a little toooo creative for me, but definitely a creative and easy to do scary Halloween decoration. For spook alleys, parties etc., you could add a glow stick. This could also be cheaply done. ( doll head in glass cloche )
Get a doll, drape fabric and spray the hell out of it with: Fabric Quick Stiffening Spray http://www.amazon.com/gp/aw/d/B00178QQ02 Let it set then remove doll from underneath and set the draped fabric back.