I was thinking of a grass effect the other day...
A second plain or matrix slightly above the ground that is textured like grass with lots of holes (transparent). Then, you would randomly move it, or scroll the texture to look like grass in the wind..
Not sure if it will work, or look any good, but worth a shot, i guess.
Then theres always shaders... Ive never tried them, but there might be one for grass, I dunno.. My comp doesent even handle shaders.. Crappy video card.. lol
"All programmers are playwrites and all computers are lousy actors" -Anon