Hi Rich I'll chime in here. Chuck is right on the mark. Pat and I were asked to do a carving demo at a local Fall festival, and were thnking about what a quick carving demo might look like. I had some odds & ends of cork lying which when combined with a little inspiration from Bob wound up being a dozen or so pickleweed dekes.
Any scraps you have lying around will work...if you'll notice Pat used different shapes/sized scraps to make different species...Mallards, Pinnies, Widgeon, etc.
Fun project and a long standing tradition. In addition to the Dave Hagebaumer painting Bob mentions, the August 1932 edition of Fortune magazine features an article about Joel Barber and decoy collecting, 7 drawings by Barber are used to illustrate the article, one of those is of a drawing of a Mallard Drake's head stick-up decoy from Saskatchewan, Canada.