Another rage quit. This mostly represents a culmination of physics and pre-calc really getting at me. To answer the question - the texture was used to tell or clarify a story, as opposed to using it as a means of creating some general mood. It does that as well, but also solidifies what the subject was thinking about.
Tech - sticks, my room, self-shot. The texture was also taken in my room, from my notebook.
Post - Layers, multiply, eraser, hue, saturation, levels, curves, darkness / contrast.