Some resources that offer lists of several dozen party themes are Stylecaster, Shindigz.com, Party City and Oriental Trading. Common types of themes include eras such as the 1960s, other cultures such as Moroccan, and activities such as a furniture swap party.
Stylecaster lists 101 party themes, including a board games party and an Old Hollywood Glamour party based on actors from Hollywood's Golden Age, such as Katharine Hepburn and Clark Gable.
Medieval and safari themes are on the Shindigz list. Shindigz, also a party supplier, carries an entire kingdom castle theme kit and has medieval props and paper plates. Blow-up animals and animal party favors are available for the safari party.
Party City has more than 100 themes and suggests a Kentucky Derby party and a children's Dr. Seuss party. Ideas from Oriental Trading include a ninja theme for kids and a Duck Dynasty theme for adults. Both party supply companies sell decorations and other items for their themes.