If your still looking for help, I did a field that you might want to take a look at. I used store bought field grass from Hobby Lobby and made the field for my "Alien Camp".
I took several strands of grass and using a forked tool I made from a piece sprue, I "punched" the bundle into a base of styrafoam (sp?) I was pleased with the results.
I don't get to this forum too often so if you have any questions, let me know through e-mail.
I hope this link works. If not, go to digitaldioramas.com and and check out there galley. Look for Paraclete's projects. http://groups.msn.com/digitaldioramas/paracletesprojects.msnw