Some good bat mitzvah party themes include the beach, princess, or the guest of honor's favorite movies and television. Other fun ideas include Israeli, Candyland or magic themes.
Decorate with bright Hawaii or ocean-themed items for a beach party. A fairy tale setting with castles, dragons and lots of pastel colors makes the guest of honor feel like a princess. Roll out a red carpet for a television or movie party. Ask guests to dress like celebrities, and name tables after the stars.
Decorate in blue and white to honor Israel. Use bright colors, hand out bags of chocolate, and fill glass vases with hard candy for a Candyland theme. Center the celebration on magic by hiring a magician and asking him to teach the guests simple tricks.