The ability to render realistic grass has been included in the (SELECTseries 2) release of MicroStation. Below are the steps and a couple tips on working with the data.

1. Open the Material Editor dialog.
2. From the Material Editor dialog drop down menu Settings > Advanced
3. Load the Landscape.pal [Bentley_Materials.dgnlib] palette.
4. Select a grass lawn material from the list.
5. Click on the Fur tab and check ON Fur.
6. Modify settings as needed.