Sure, you can drag out last year's Sarah Palin costume. Or be zombie Michael Jackson... just like those other 3000 people you'll see Halloween night wearing that costume. The Scooby Gang? Yawn. It's been done. The Simpsons? How 1991. Why not do something different this year?
Why not cosplay for Halloween? J-List has a ton of ready-made cosplay outfits and accessories from manga and anime like Hell Girl (perfect for this holiday), Inuyasha, Evangelion, Naruto and Bleach. I'm not trying to get you to buy from them-- just to check them out for some cool ideas. There are lots of cosplay suppliers online to choose from. What I mostly want you to do is just look at how cute and cool the models on J-List look.
Doesn't that inspire you? No?
Okay then. How about this?