I'm unsure, so correct me if I'm wrong, but I don't believe there are any Halloween Minnie ears/headbands. I feel like we have a lot of special mickey ears, but the minnie headbands are always so cute! could make a Minnie Bat/Pumpkin headband to compliment the Mickey versions.
also! a cool H&S idea could be Nightmare Before Christmas. Unsure how many options you'd create, but you could have Jack, Sally, Oogie Boogie
I also love the previous villain items, and maybe it's possible to bring back some full outfits? Hades, Jafar, Frollo, ect. Maybe even a simple Sid shirt? (not sure if there already is one).
The sunset pin set is also sooo pretty, I remember loving it when I saw Hogie wearing it. Maybe we could do a similar thing but instead you earn them from playing the Haunted Mansion?
I don't spend much time decorating my room, but I really enjoy collecting and creating outfits as well as sets on my lanyard. Hope these ideas could help! :-)