Free Grass Textures
Real Enviroment Xtreme (REX) have posted on their forum a grass texture upgrade for Fsx. It really improves the quality of the grass.
Link: http://realenvironmentxtreme.com/forum/index.php?topic=2167.0
Also, take a look at their free road textures at http://realenvironmentxtreme.com/forum/index.php?topic=3365.0
In the pictures, you can see pictures of 2D cars. However there is also a texture included showing no traffic if you want to use the default fsx traffic that moves for more realism.