My number two son is very creative when it comes to Halloween costumes. He makes up his mind early, decides how to do it, and then does it. This is the son who two years ago decided he wanted to go as a mountain. He then convinced his brother to go as a mountain too, so they could be the Wasatch Range.
This year, for whatever reason, he picked his costume early. He found a big cardboard box that would suit his purposes, and planned his course of action. My wife did the cutting, but the planning was all his.
I've posted his handiwork if you'd like to see it. Oh, and I should mention my son's name is John.