Go in a costume that can be turned inside-out and look differently. That way, you essentially have two costumes, and you can go to each house twice. :D
Or he could go with a trollface and he would visit the same house and when the person asks why he doesn't go anywhere else he could say (While hiding his candy bag) "But I didn't get any candy"
You need something simpler, like a new hat and coat that you put over your old one.
Be a rooster. A giant rooster.
-snip
hmm a barn with a radioactive symbol on it...oh well
go as a manwith a rooster
Go as the guy that points to ordinary curry, says "chichichichichichichichichi" and turns the curry into AWESOME CHEESY CURRYJust like your avatar
This year i was planning getting a ghille suit and hide in my long grass. Then when somebody passes bye i jump out at them.