You've got the hang of it. It is similar to the "Distant forest. The grass in the background is simply the default grass material applied to the infinite ground plane. I used a more primitive version of this (mapping on a ground plane) when I wanted cherry blossoms covering the ground below a cherry tree. you should be able to use it for any kind of semi-flat ground cover. -SMT

I'd rather stay in my lane than lay in my stain!