You know those patterns you see on freshly cut lawns of golf courses, football & baseball fields & racetracks? It's simply because the grass lays one way one mowed from one direction & another way when mowed from another. Basically what you're seeing is the sunlight hitting the blades of grass from a different angle so it sort of creates a shadow. I wanted to recreate that for my layout so here's how I did it.
First I made a "mower" stencil out of cardboard. the strips are about 1" apart.

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First I shook off all of the excess grass that didn't stick to the Elmer's Glue. Next I laid my stencil across my cardboard grass strip & misted it with spray adhesive. Do this outside, it stinks.

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Next I sifted on a very light sprinkling of a darker color called "soil", which is really more like a very, very dark drab green. Again, remember we're creating shadow here. Remember to cover up the areas you've already done w/a scrap of cardboard as you work your way across your lawn.

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I let it set for a minute or two, and again, tipped it over & tapped off the excess. It is now ready to glue to the layout. I used hot glue for this first bit but will probably use Elmers glue for the rest, as it gives me more working time.

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I will have to go in and fill in the bits along the armco & do touch ups as I work my way around the layout but you get the basic idea. Questions or comments?