A dirty devil or...the classic witch? I LUV picking out Halloween costumes! It may seem a little early, but I like planning ahead of time.
You know, if you don't really like dressing up, your makeup can be your costume! Give yourself an outrageous makeover. Make it look freaky and Halloween-ish.
Of course, you could always get a storebought costume, but homemade ones are cool. You could go for the complicated but cool one, like a headless horse guy, or simple and scary, like the Grim Reaper. You can always play up your costume with makeup, makeup, and even MORE makeup!!! (And don't forget the temporary hair color!) Go crazy. Make your hair green, whatever. It'll be fun.