I'm dressing up as Mr. Bucket from Willy Wonka this year (because I have to have a costume for next year since I'm in the musical anyway), maybe you could do that. All you really have to do is get a shabby shirt and tie, then stick a tube of toothpaste in the pocket.
I also saw a costume for eggs and bacon at my nearest Target, maybe you could do that. Oh, and I saw a banana costume, too.