HappyWorldLand (link at bottom left of this screen under Web Ring) has quite a variety of textures, all for the standard Poser female. You can tint any texture by using the Material Editor to change the object color from white. Start with just a bit of very pale peach to beige, and darken as you want. Isn't as good as a custom-made darker texture because the color is added to the colors of the texture, muddying it up somewhat and decreasing the contrast - but it's an easy way to get some variety.