This transformers papercraft is a life size Optimus Prime costume, designed by ProjectKITT. The costume is divided into 9 different parts: the front, back, shoulders, mask, upper arm, lower arm, upper leg, lower leg, and gloves.
The biggest investment was time as it only required about $30 worth of materials. It's mostly made out of cardboard, wrapping paper, clear packing tape, and tagboard. You can get cardboard for free at any grocery store, and the same goes for the tagboard if you plan on buying cereal anyway. You're also going to need a hot glue gun and lots of glue! [via ProjectKITT]