I think a good Halloween idea for dressing should be a Disneyland theme. You can dress like prince/princesses and the royal family, make royal crafts and recipes. Your party ideas can also be royal and decorated like in Disney shows.
Try being a witch, a zombie, vampire, a ghost, or some bloody creature. Hope this helped! something extra: decorate your front yard with disgusting body parts and grave yards. Put lit up pumpkins inside your house in the window and a boom box by an open window playing loud, scary music. Be sure to have strobe lights and fog machines around.