What should I do to my ice skating dress in order to make it more “Haunted House" style?

So I have this red stretch velvet ice skating dress that has a mesh for the shoulder area, long sleeves, and some sequins. My vision is for the dress to be red, black, and purple. I also have a goal to keep it under $50. I hope for it to be dark. Sorry I can't find a picture. Any cheap ways to make my dress like a haunted house theme for my competition?