This is something I wanted to do for a long time. A Roof building itself. It could be a lot better with different camera angles and better textures etc but I got bored with it. I have removed the grass texture but have left the node tree there so just drop your own grass textures in there. Feel free to improve on it anyway you like, but if you do would you let me see your improvements please. See the video here https://www.youtube.com/watch?v=_w8MIaKTuEQ&t=5s