Sounds like you want the Hammer film type of gothic, rather than the panda-makeup and fishnet variety that dominates currently? Some of RDNA's BeastHunter stuff might work, Transpond's Whitechapel construction set also at RDNA, various Victorian era historical gowns dotted around (eg AprilYsh's Ashley dress at DAZ). There's an Underworld set of bone furnishing's at DAZ, by Catherine Todd I think, and SAMS3D have a couple of gothic-haunted houses.