"Bleeding" candles, made by dripping red wax down the sides of white candles.
Low lighting (achieved by removing bulbs - a bit ghetto, I know, but it's what I had) + nifty "mummy" gauze bits strung all over light fixtures.
Red/range glow in hallways, done by draping red and orange sheer fabrics over the light fixtures (I was very careful not to touch the fabric to the glass of the light fixtures. No sense risking fire). + More "mummy" gauze draped across doorways.
Cute little Halloween bottle labels from the party store. Most of these are bottles of mead that my boyfriend brews at home. (Look - more "blood" on the countertops that I had to clean up later).
Every available surface had dead rose petals and leaves scattered across it, vases full of dead roses and bunches of dried herbs from the garden, and as many drippy candles as I could pack in.