Using a borrowed stencil for painting on marsh grass several years ago I picked up a Cabelas catalog this fall and saw they get $25 for a painting stencil, WOW! And then you have to pay shipping and wait for it to arrive.
Using the download below you can make your own stencil in about 5 minutes...
First print the stencil. Then lay the stencil on top of cardboard or a plastic For Sale sign and cut through the print out and through the cardboard or plastic around the gray outline of marsh grass. That's all there is to it!
I would recommend spraying your colors in the following order: black, brown, then kaki. These are the three ultra-flat camo Krylon colors in spray cans available from Wal-Mart.