Neighbor being rude and wife wants to make a gothic garden. – Reddit Post

Hello this is my first post here and am new to this sub so I’m sorry if I mistake anything. So me and my wife have a horribly opinionated neighbor about how our front garden looks and has been saying to my wife it looks like shit. She is very religious and my wife and I are most definitely not, and she has commented before about my wife’s Hail Satan garden flags. So she is now in full blown petty mode and I’m all for it so she wants to make an all in gothic garden. So I just wanted to ask what kinds of flowers or plants that are black that can grow in New Jersey that I can recommend her to start with planting? She is also very new to gardening so this would be a first big project for her so easy to maintain would also be great!