What to be for Halloween?

It just donged on my yesterday that Halloween is quickly approaching. We're having Halloween at work on Thursday, October the 29th. I know that I want to dress up, but I'm still not sure who or what to be. My ideas include: 70's girl, balloon girl-instead of balloon boy, or trophy wife. Out of all of these I feel that 70's girl would be the cheapest. But I love the balloon girl idea. I was thinking about taking a cheap laundry hamper and cutting the bottom out of it. Getting a bunch of helium balloons and try and make it look like I'm in a hot air balloon. I think this would be super cute and I may win the prize this year! For Saturday which is actually Halloween (if I buy a costume)I was thinking of being either Mother Earth, Beer Girl, or Angel. I have always wanted to be a German Beer Girl-so I would probably go with one of those costumes. But their so dang expensive. Which probably means that I will just make something.