OH the lawn... That's geometry scattered with forest, and two extra forest for leaves and grass decorations like wild things that grow with the grass :P
There are 4 grass clumps, each with slightly different textures and colors, on top of that some mixes with noise masks to randomize all, recently i found a new way of texturing grass, hope to show that image on the next week, it allows for more control on the color and discoloration of grass and it could help on very big areas of grass to avoid repetition.