Any ideas for a girls 15th birthday party?!

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What about a Hawaii Themed Party (by the pool) Wear Hula/grass skirts, flowers around the neck. You could buy Tiki Lamps ( I don't think they're that expensive). Maybe make an exotic fruit punch and a BBQ.

Another idea is dress as your favourite character from a movie/ pop star/ celebrity. Glamour/Vegas style party...everyone to get all dressed up.

I heard of someone having a Lady Gaga themed party once where everyone dressed in Gaga style....it sounded pretty cool! Or maby a neon part where every one wore ducktape on thier clothing and wore bright colors!
get glow sticks but play glow stick tag! the best game ever! ok to play glow stick tag someone has to be it! the person who is it has to have a pillow case over her head so she cant see anything. the game is played in the dark. glow sticks are given to everyone and turned on the glowsticks will be visible under pillow case. the person tries to catch peeps with lights and who ever they touch is it! kinda like zombie , dead man ect. and something to go with the tee peeing is egging u shuld egg houses. find a way to get ur parents to do something else. go sleding have an epic snowball fight. Go intertubing, thats when u ride a tube down a hill, its really fun and exciting!! oooh make snowcones! no one thought of that one! snow cones! have an unlimited amount of the flavor stuff and thier is plenty of snow outside so u use that! oh and if thier isnt enough snow outside just buy an ice shreader and a ton of ice! or u could just smash da ice wit a hammer! u could hang somewhere like a cofe shop(so u woudnt have to be wit p-arents.) hot chocolate or apple cider! watch dumb movies and u can make fun of them movies like Twilight and Titanic ,(those are good movies but peeps like to make fun of em) Have a tent slumber party and sleep outside!dance to music
have an epic water ballonn fight! be sure to cheat and use the hose

You could do a makeover party and do makeup, nails, and hair. If you have favors (treat bag) you could get some makeup, nail polish and hair accessories and that is also what each of them use instead of sharing. Its not expensive if you go to the dollar store.

Maybe a creative cupcake baking contest like on that Food Network show? Filming a silly horror movie on your video cam? Create a fun "dating" board game with the names of guys from school?