Haven't posted in a whle so I thought I share something with the community. I rewatched a movie a little while ago and had a nice idea for a group of antagonists and I could squeeze out a couple of scenarios out of the whole thing. That movie was Manos: The Hands of Fate. Yes... Manos...
The setting is the Southwestern USA - I used Pima county, Arizona - and my idea was, that there is a family of oldschool Mormon farmers out there in the desert, who became servants of Shub-Niggurath. The Master character of the movie is replaced by the family patriarch. His several wives are well... his wives. The Torgo character is a son of his, who was changed into one of the Blessed of Shub-Niggurath years ago. The head of the family also has other children. So basically there's a large clan of Mythos-worshippers living somewhere near Tucson. In my version, there is another, more bestial looking blessed of Shub-Niggurath besides the Torgo stand-in living in a hut in the family's corn field.
Some scenario seeds:
The head of the family or a son of his wants to marry a woman from a decent Mormon community. Perhaps a relative of a PC.
The clan always has a bountiful harvest of black maize, which causes its consumers to experience awful nightmares about the Black Goat of the Woods.
The usual thing about travelers disappearing near their land. These can be caused by the clan itself or by Fungi from Yuggoth allied with the clan. After all, mi-go worship the Black Goat too.
I have read on the site about the scenario titled The Spawn from The Great Old Ones supplement. It states, that there is animosity between the worshippers of Yig and the followers of Shub-Niggurath in the Southwest. This could escalate into a cult war with Yig cultists trying to use the PCs against the clan or vice versa. Or they could just stumble into the already ongoing war.