Essentially you want to make arrangements of objects that have a slightly sinister feel to them. You can purchase them new or hunt thrift stores, craigslist or your attic. Things to keep an eye open for are: old books, black bird cages, fake crows
black foliage, apothecary supplies, skulls and bones, interesting bottles, lanterns, velvety tapestry, metal goblets
I'd love to see pictures if you pull it together!