I have tween girls, they would like all the above, I have also seen inexpensive "cooler" Disney socks and accessories at Hot Topic. Costco has Jenna Hipp nail polish minis on sale right now. I am getting those and keeping them packaged for the flight. Another idea is the new gold and silver temporary tattoos. They could be cut up and distributed.
Keep in mind, this age, atleast mine, have outgrown the hello kitty and polishes that come right off, including the crazy flavors of cheap lip balms.