Human tea bag: This simple costume won’t make you look like a dip. Get a white pillowcase (for kids) or a plain sheet (for adults), and seal the edges, leaving holes for the arms, legs and head. No sewing machine? No worries. Using sewing/craft tape from a craft or fabric store. Use the top of a tea box as your tea tag, attached with a thick string hanging out of the costume top.
Dirty-laundry bucket: A cheap and easy costume even the least creative person can handle. Get a plastic laundry basket, and cut out leg holes. Pull it up to the top of your legs and fill with clothes, hanging other clothing items from your head, your arms and the basket itself.
Cereal box: A cardboard box does wonders when spray-painted and decorated like your favorite morning meal. Cut holes for the arms, legs, and head. Spray-paint the box depending on your desired breakfast cereal. Sketch the design onto the box when the paint is dry, adding the details in permanent marker. Print out an enlarged nutrition fact sheet for the side, and don’t forget to glue actual cereal in the bowl on the front. Just give it enough time for the glue to dry.