Was washing up a fizzy bottle the other day and I started drawing lines on it in my head. Grabbed it out of the recycling bin this afternoon and got to work with a pen and some cutting gear.
http://i844.photobucket.com/albums/a...ps4aa44d03.jpg
http://i844.photobucket.com/albums/a...ps0ccd6f8d.jpg
http://i844.photobucket.com/albums/a...ps5a94e0fe.jpg
http://i844.photobucket.com/albums/a...ps64d360b0.jpg
http://i844.photobucket.com/albums/a...ps75a427bb.jpg
Poke a couple of holes in the right places for stakes, sand the surface a little and paint, .... voila "the cheap buggers pigeon decoy!" Advantage being they will be very light and compact and cost next to nothing.