[c#] Create visible appearence of a grid using texture or models

I am curious as to how i can create the look of a criss cross game grid, by repeating a texture or model.
I am looking for something similar to this:
Sample Grid from another game

My game level is meant to be dynamic, so i cannot just stretch the grid or duplicate my model with the transparent texture. How would i do this in unity? My levels will be quite big, so i am unsure if using a loop and instantiating objects will use up too many resources.

If you have Unity Pro, the GL API will get you there using the GL class.

// Not tested, but something along these lines (ha) should do the trick
Graphics.DrawMeshNow(myPregeneratedGridMesh, Vector3.zero, Quaternion.identity);