Ciminyjicket created a great robot costume that can be made from scrap wood, cardboard, and PVC pipe. The effect is really great.
Here are the build notes…
Uploaded to YouTube by criminyjicket
http://www.youtube.com/watch?v=bHGtiRo7_gc
Retrieved Tuesday 4th October 2011 9:28 am EDT
Here is a little more complicated version of the same idea. I personally like the chicken robot the best, though…