Some unique themes for a sweet sixteen party is a red carpet party, a western party, or a Caribbean theme. You could also do a European themed party to entertain your guests.
A Hollywood red carpet theme would be a great idea for a sweet sixteen party. Twilight/Vampire theme parties would be a good option for a more gothic teenager. Karaoke would be a great activity to do at a High School Musical themed party.
Some unique themes for a sweet 16 party are an 80s theme where all guests have to dress up in 80s attire or a costume party where they can dress up as whatever they want.
One neat theme is to have a pinata party. Create 16 pinatas that reflect the birthday girl's interests. Fill them each with something different and let the guests come out swinging. You could also have a Twilight party where everyone comes as a vampire or a werewolf.
