Delphi,
Sounds like a procedural texture.

Go over to CG Textures. http://cgtextures.com/
Search on Grass - you can find good tiled grass textures there.

Then if you have paint or gimp or similar you can also make a displacement or bmp map that might work very well for you.

Other options are the Bryce Shaders that have been setup to work for D/S that are sold over at DAZ. Also you can look at other ground options you may have with other props that may do what you want.

Cheers
DBRv6