A few themes I came up with:
Gravewalkers; built around a graveyard theme. (Gargoyle/statues, maggots, grave dirt, corpses, grave flowers, ect)
Huntsmen; based on a grand hunting procession. (Hounds, heralds, musicians, prey, ect)
Witch's house; based on a fairy tail witch. ("Creepy" animals, mushrooms, plant gatherers, strange guard beasts, ect)