Quick preview set up of Flinks Meadow preset 9 with a couple of scaled down Anton Kisiel Ants. Ground plane is my HighRes plane prop with slight morph.

I personally would build my own grass blade .obj's and other elements for duplication as flinks meadow props are are a little low res for the project you suggest. I guess it all depends on the amount of work you want to dedicate to your vision.

There are like 50 million vegetation ground cover freebies out there in various formats...

Ps. OT, really need to create a custom texture for the Ant (has a nice cylinder UV) and hairs smart prop... really love using the little dude! http://www.daz3d.com/ant