You can have a color map and a detail map.
A detail map is what you use for grass.
A colormap is something like this
[imghttp://i13.photobucket.com/albums/a260/MortiisGames/Untitled-1.jpg]
Simply what you will do is, apply your grass texture on the cube, then apply colormap stretched to your cube size with scaletexture on it with the "color" texture flags(LoadTexture("", 1+8)) .
A detail map is what you use for grass.
A colormap is something like this
[imghttp://i13.photobucket.com/albums/a260/MortiisGames/Untitled-1.jpg]
Simply what you will do is, apply your grass texture on the cube, then apply colormap stretched to your cube size with scaletexture on it with the "color" texture flags(LoadTexture("", 1+8)) .