It's not as difficult as you think..... just get a few yards of cheese cloth, put some rips in it, then throw it in the washer for 10 minutes. Pull it out, lay flat to dry and use some scissors to add extra "frays" to it. Once it dries, lay it across your furniture. (Couches and large stuffed chairs will look best)
Also be sure to add a few felt bats, some creepy family portraits and lots of candles!