Well, the meadow is a mix of models from vizpark real grass and self made objects. I created a little parametric grass rig for Cinema 4D to build my own grass patches.It will be released for free on our fb site this week. ;)
Yes, it works with splines and other mograph stuff. But you should convert the patch into one poly mesh before you scatter it. Cloning parametric objects in C4D is a pain in the ass. ;)