Or whatever it is so your clone shows up behind the grass, which I've gathered from the forums, seeing as bild15 crashes every 2 minutes...

Could we use this method to make a forest? Just wondering.

Yeah dude! Thats what I've been saying since build 14. We should be able to make taller grass now, but the only problem is that the avatars crushes the grass in places while they walk across it. Its gonna look cool as ♥♥♥♥ when they make it to where your completely hidden in the high grass...lol...high grass...anyway its gonna look cool when bulletts pass through high grass and blood starts spraying everywhere and a head or two pops up above it revealing the enemy position. it would only be good for multiplayer, but it sounds cool to me!

If you can get it uncollideable, that would be interesting.
Then again, clones seem to have layering problems with everything they can phase through, not just grass. Poor clones getting buried in dirt...