For a really random party, pick out something that doesn't make any sense! Or you can draw random things! (such as mustaches, dogs, cars, airplanes, pizza etc.)
Get a huge pice of paper and cut it into the shape of mustache. Write "Happy Birthday" on it.
Hang anything from the celling. (paper, string, streamers, balloons, pencils etc.)
Randomly pick one of your parents cd's(ask first) then play it. It might be something totally crazy, or something you might actually like! (there's a shock!)
Man Hunt, tag, freeze tag etc.
Have a crazy fashion show! Make a big pile of clothing and accesories, then each person picks 1-3 items. watch your friends strut down the runway in the craziest ways! (you can ask your parents for clothes, purses, hats etc.)
Put anything on your cake! Get a mustache, a princess, race cars, winnie the pooh, care bears, backyardigans, or even Dora! (all of these are for boys and girls! It's supposed to be random! Don't feel weird if you get a princess and your a boy!
PUT ANYTHING YOU WANT IN THEM! IT DOESN'T MATTER! BUT ANYTHING YOU WOULDN'T NORMALLY PUT IN YOUR GOODIE BAGS!