I dunno about the \"blown by the wind\" thing but for tall grass you can use bristles from a larger paintbrush - I picked up some perfect ones for cheap at a dollar store recently. The bristles are kind of a pain to handle but at least they can be \"stained\" in diluted paint or ink to whatever shade you want.
Steelcult is right. Woodland Scenics puts out just about any grass length and type you want, as well as rock, ballast, etc.
If your local hobby shop doesn\'t carry it, try a toy train shop. I have found them ( at a little higher price) at Hobby Lobby.