My friend threw a mind-blowing party for her daughter, not for 16th bday but for Jr. High graduation or some such thing, so this could be altered. They had a party, "What Would Barbie Do?" and first made a video to invite everyone - kind of like a mini-movie where some of the girls acted out Barbie going shopping downtown. There were boys and girls invited, the colors were pink and black, they made wristbands like you would get for an amusement park as the tickets to get in. The girls all chose something like New York Barbie, Rocker Barbie, Prom Barbie, etc, various barbies. The cutest think was they had made a large Barbie box out of a refrigerator box, painted pink etc, and they took everyone's photos inside that box.
They involved the boys by having a relay race where they all had to change into kind of barbie type clothes over their regular clothes and race - relay style.
So you could do something like this, with or without the Barbie theme, but do make a photo booth, the wrist bands, and maybe a video invite! They just posted the video online and people had to go and view it.