I'm aware of some pattern swatches on the Adobe Studio site (under the Illustrator section) that are used to simulate various landscape and textures. I used to see such things employed in architectural renderings back in the day; still may be used. Here's a link:
<http://share.studio.adobe.com/axBrowseProductType.asp?t=30>
I believe these same swatches are also included on the Illustrator CD-ROM.
Regards,
Michael Hamm
- <http://www.ergodraw.com/>