There are two types of material I used, they are both come from material source greenpaint and sliver_body. On the other hand, I added some aiNoise for aiCurvature for the object edges. Then I blended all materials with linking to two aiMixShader. First result is a greenpaint as the main compound with silver edges, and second one is the opposite one.

The result is quite satisfying. Of course, I supposed to do more detail adjustments on each parts of all gears to have a even better result. And I haven’t add any texture and bumpmap yet, probably I will do it later with lighting adjustment as well, while the object is put in scene. I think the reflection is too smooth and flawless at this stage.