Two favorite costumes come to mind: my sister and I once went wearing large boxes decorated as boxes of cereal - I went as Post Ghosties and she went as Rice Creepies. And my girlfriend and I a few years ago went dressed in white body stockings and white swimming caps, decorated with lines and numbers to make us look like thermometers. She wore silver shoes, and was an oral thermometer - I wore brown shoes - I was an anal thermometer - used, of course!