I was looking at a few integrated seat post designs, what kind of clamps they used.

This clamp looks innovative. I couldn't find a better pic that showed any more of what it was. Seems like a half circle, flat end against the bottom of the seat rails, that swivels to adjust angle. Then two straight bars on top of the seat rails, and by adjusting the tensions of those two bars, which one is pushing lower against the seat rails, it adjusts the angle.

Like I said though, I can only sorta see it and don't know what's really going on. If anybody knows more about this, or other innovative seat clamps i'd love more info.