Need some suggestions, please!

This weekend is Halloween and there's a party on Saturday, need help with ideas. As some of you know, Halloween is one of my favorite holidays and I LOVE finding the perfect costume and then dressing up, but I need a good one. Last year me and my roomie were the Spartan cheerleaders from SNL, it was a hit, and the year before that I was Princess Leia, which was just okay. Anyway, I am welcoming all ideas and hoping you leave a comment, thanks!