An Into the Past pack where Sims get to travel to the stone age, the dinosaur age, and the bronze age. Supernatural potential: Werewolves
An Atlantis pack with underwater zombies and lots that you can build completely underwater. I wouldn't mind having Steampunk style with this and water theme style.
A rock band/broadway show pack with musical instruments and couple and group dancing and singing and playing in a band together. Supernatural potential: Genies.
Farm Pack with farm animals such as llamas and unicorns and horses and chickens.
Back to School pack with the return of imaginary friends. Kids get to go to school with preschool, grade school, high school, home school, and military school. Option to go on camp field trips too and proms.
Superhero pack. I think it would be a creative way to represent disabilities. Sims could have X-ray vision, rocket wheelchairs, flame thrower canes, prosthetic legs and arms with cool tech kind of like Inspector Gadget, chest plate like Iron Man, sonar ability, telepathy, etc. I guess the feel of the pack would be related to this article: https://folks.pillpack.com/why-the-world-needs-more-disabled-superheroes/ Basically a way for more representation in the game and comics with the superheroes are one way that has been done.
This was an idea from Koffee. Basically she wanted a wedding pack for different cultures. I think it would be a nice way to get more romantic interaction in the game.
RV pack, which would require a car patch. Travel the world with an RV you can drive around. Would make fun use of Tiny Living and would be neat to make a retirement community. It would be fun to bring back the gardening gnomes from the Sims 1 with it and make flamingos help with fishing. Could bring back mini golf with it too.