Hi Tony, yeah something like blades of grass tend to be better added in by some render-specific tools in your rendering program rather than trying to explicitly model them by drawing them directly.

It can be possible to adapt a hair or fur rendering system to generate blades of grass on an object at render time, if your rendering program has such a module.

There are also some polygon modeling programs that have some mechanisms to automatically create stuff like that - that plug-in that Pilou mentioned for SketchUp, and also there is a program called Vue which is focused on generating all kinds of natural scenes, that may be of use: http://www.e-onsoftware.com/

MoI itself is much more focused on drawing things directly, but for blades of grass you really don't want to try and draw each one of those directly.

- Michael