Low poly tree Pack ( Jungle, palm & savannah )

My first low poly pack, inclued 10 tree with materia, 5$.

https://www.assetstore.unity3d.com/en/#!/content/78808

 

Looking at the asset list I don't see any textures listed. Does each tree have its own unique material and shader?

 

No there are no textures, there are 5 materials in total for all threes, you can easily, i find the rendering much better than with texture.
That said it may be a mistake i make with this choice, i am open to any proposal for improvement for this pack or for my next création.

 

I don't know if there is a confirmed consensus about what is better - either a small 16x16 or 32x32 size color palette used for one texture for all mesh pieces, using vertex colors, or built in material colors in the shader.
Please update if you get feedback regarding this.

By the way - the trees look well done.