
What kind of shader or technique(s) should aim for?
Thanks.

What kind of shader or technique(s) should aim for?
Thanks.
I would suggest vignetting for the darkening corners: http://docs.unity3d.com/Documentation/Components/script-Vignetting.html
The GrayScale in addition: http://docs.unity3d.com/Documentation/Components/script-GrayscaleEffect.html or perhaps some more complicated version using Color Remaping.
Other than that, the image looks like a normal diffuse shader on the objects to me.
Looks to me like a mixture of either Screen Space Ambient Occlusion or the new Screen Space Ambient Obscurance effect, Vignetting, Fisheye, and maybe Tonemapping. All these effects can be found in the Component>Image Effects menu (Unity Pro).
On top of those, I'd also say Fog and Soft Shadows - both of which are built-in components in Unity Pro.
– tanoshimiThanks guys, I tried your suggestions but could not reproduce or get even near the image I posted here. Politely, I would appreciate a more detail reply.
– test84