Bloody Candles
For a straightforward, scary piece of Halloween décor, take a red candle and melt it over top of a white one so the red wax runs down like blood.

Cheesecloth Spirits
Glue cheesecloth onto foam mannequin heads (available at wig shops) and hang them from the ceiling. Spook them up with a fan on low speed.

Find many more great Halloween décor ideas at homedit: 20 Super Scary Halloween Decorations.