Here's a very impressive and inspirational 17 foot tall Gandhi papercraft from artist Joseph DeLappe (Associate Professor of the Dept. of Art - University of Nevada). Technically not papercraft / dipping into cardboardcraft, at this size I'm pretty sure paper is not an option because it's not going to be rigid enough. This Gandhi is based on the designer's character/avatar from Second Life (internet-based virtual world). For those interested in creating larger than life papercrafts/cardboardcraft you can check out Mr. Delappe's step-by-step process at the link below - Pepakura is involved :)
17 Foot Tall Gandhi Papercraft [instructables]
Joseph DeLappe [UNR]
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