Harry Potter plots I have if someone wants to take then and make them into a story:

HP/LOTR crossover: What if Harry was Aragorn's only child and when he was 3 months old Aragorn had to send him to Earth to protect him from the last renments of orcs. But now 15 years later Aragorn wants him back.

HP: What if Hermione, Draco, Snape and maybe Voldemort when back in time to Harry's first year in their younger bodies after Harry was betrayed by Dumbledore. What would clueless 11 year old Harry do when he suddenly has four over protective people watching over him.