Hawaiian Luau
This is a party theme that can be carried out inexpensively, and is lots of fun. Go to your library and get CDs of old-fashioned Hawaiian music. Decorate the space with streamers and fresh flowers. Serve fruits like pineapples and oranges with sweet dipping sauces, and make a huge bowl of fruity punch. Give each teenager a lei and have them compete in limbo contests and ring toss. Allow them to float away in a tropical dreamland.

Cinderella's Ball
In a quinceanera-style celebration, celebrate your girl's sweet 16 in a fairy wonderland. If it's possible, ask guests to wear formal attire, and drink sparkling grape juice out of plastic champagne flutes. Serve playful "grown-up" foods like petit fours and finger sandwiches.

"Grease"-ers
Perfect for a co-ed birthday party, have a '50s style sock-hop. Ask if you can rent out your local high-school's gym or your apartment's rec room for this old-time rock and roll party. Ask kids to dress the part, play songs from the soundtrack as well as other classic '50s tunes, and serve diner-style burgers and milk shakes for food. Hand out sunglasses or hair combs as favors.