Most of my ideas are about the ocean. One in particular that I want to share is about a mermaid.
Okay, the first direction I could go from here is that she wants to be a human, be with a human, or otherwise have a girly romance. I'm not that kind of a person.
The mermaid in my idea is a traditional mermaid, not a Disney princess. She swims around, singing to lure men to a watery grave. She hunts, she fights, and she drags sailors to the bottom of the ocean to devour their flesh.
Her sister is an embarresment. She swims around, flirting with the mermen, distracting everyone from their jobs, and being
nice. An outrage among sea creatures. When the sister falls in love with a human, the mermaid is sent out to kill him and train her sister to be a proper mermaid. Unfortunately, the human she has to kill is the one who fights back. The two become tangled in a web of fueds and lies, and she must discover the truth about the man, before it leads to her grave.
If you like that idea, then I can post more.