A haunted nursery needs some haunted kids. When I did a nursery scene I went to a local flea market/rummage sale and loaded up on old dolls. I took them home and repainted them into evil looking little children. Some of them were in a cradle, some were sitting on the floor playing and some were just on a shelf. I still have them on the shelf in my office as a display. Also, some of the blocks with letters on them....glue them together to spell out phrases. REDRUM seemed to be the biggest hit with parents. Find a doll house and repaint it to look like a haunted house as a filler piece in the room, or maybe make it look like a funeral parlor. One of the greatest compliments I ever got on my dolls came from fellow forum member BlackCat. I had painted a dolls face black, glow in the dark paint on the eyes, lips bright orange, and then glued white feathers all over the doll. I stuck it in a birdcage lined with newspapers, then I stuck another doll, like the little dolls that came in the happy meals a few years ago, in the cage with the bigger one. I had ripped off one of her arms, stuck it in the bigger dolls hand, and covered the little doll with fake blood and had the blood dripping down the mouth and feathers of the bigger dolls. BlackCat comes along and says something to the efffect, "That's just SICK". What better compliment can you ask for! Total cost of that little prop, which is also on display in my home office, about $1.97 for the feathers. I found the cage on the curb on bulk pickup day, the paints and fake blood I had here and the doll was bought at a rummage sale where it was bag day, so I could fill an entire garbage bag for a dollar. I'd say total it cost MAYBE $2.50 and I LOVE it!
Another idea may be to have the kids singing that song from Nightmare on Elm Street playing softly...One, two Freddys coming for you...three, four, better shut the door...etc.