Two useful little things to remember about textures. 1: Poser 5 and later, you can tile the texture in the Materials Room. Set the U_Scale and V_Scale valuse to 0.1, and pick the Tile option, and the UV map is tiled with a 10x10 pattern. You don't need a tiled UV map. 2: You can overlay textures, so your tiled grass pattern can be overlaid with the field markings. It's a long time since I was on a sports field, but what I recall is the look was of painted grass. You could have a tiled pattern providing a bump or displacement effect, with the actual colours being changed by something like a blender node controlled by the markings pattern, switching between a colour grass texture and whatever colour you want for markings.