Draw outline around 2D shape

I have a design composed of shapes. This is for a 2D game. I want to draw outline around the object which is an FBX created in blender. I tried the silhoette diffuse outline only shader. But it colors the whole shape with the color specified for outline. Is there a solution to it?

I use this…

http://forum.unity3d.com/threads/highlighting-system-released.143043/