How to achieve a paper tone ?

Guys, im doing a turn-based isometric game, which i use the recycles mind as art theme.
All units and buildings are made of cardboard and things like that.

But i could not achieve a nice feel of cardboard.
Could someone give me a tip about how to achieve this tone ??

http://wildfireworlds.com/wp-content/uploads/2012/08/wfw-screen5a.jpg
http://wildfireworlds.com/wp-content/uploads/2012/08/wfw-screen1.jpg
http://wildfireworlds.com/wp-content/uploads/2012/08/wfw-screen2.jpg
http://wildfireworlds.com/wp-content/uploads/2012/08/wfw-screen6.jpg

Source : http://wildfireworlds.com/

ps.: Forget about the tilt-shift effect, since i dont have a pro license.

I think a normalmap with a little noise could give the effect you want. A bumpmap helps too.

One thing you could do is create a tilable cardboard texture and set your UVs up for tiling.

Do you have any 3D application? You would need that to set it up or a code that stretches the unity assets UVs according to the lengths of each side.

Another thing would be to bake the lighting to get lighting like that, however that is a pro only feature unfortunately

I use Maya as 3d application.
And what about a shader, to get this opaque aspect. ?
If you look closely to the street, you will notice a little shadow below this, like a real paperboard would have.
Can you imagine one way to do this with indie license ? Projectors maybe ? Or maybe the shadow could be part of the mesh object, and use a black texture. No ?