We're glad you like the new presets ! We will create more of them for next updates.
About the materials, i'm afraid there is no way to get colors suitable for all scenes. Most of times we will necessary to adjust it. In this case, i suggest the following procedure (for VRay, but the method is similar for other engines):
- Use the same material for front/back in VRay2SideMtl, turning the Back material tick. This will disable the fp_grasstexture_difusse_blue texture.
- In Forest Color set Tint->Override->Random Strength to 100%-100%
- Set both tint color selectors to pure green.
With this configuration, you will get a brillant greenish color. From here, adjust Strength/Tint to get the tone you like. I hope that helps.