To make the costume you'll need:
white paper egg cartons
white newsprint or tissue paper (rainbow colors would be great!)
toilet paper tubes
metallic cardboard, (or rainbow paint your regular cardboard)
stapler
Simple Steps:
cut a rectangular strip of cardboard about 4 inches wide and 10 inches long
fringe newsprint, then fold the ends over the cardboard and staple
cut ears from egg cartons and attach with stapler
create cone shaped horn from metallic cardboard and staple down
cut toilet paper tubes so that they can fit over your wrists and ankles like a cuff
fringe more newsprint and staple to cuffs (place tape over staples to avoid irritation)
shape the ends of the toilet paper tubes to look like hooves.