Actually, I think that the sleep-light on the MacBook Pros came first. The small bar of light that's right next to the IR receiver on the front-right of the body.
That bar is actually a series of those small holes to let the light through. The green light for the metal casing came later IIRC.
The green iSight light predates the unibody MacBook Pros. At some point they changed it from a visible hole to small invisible ones. Those laptops still had the sleep-light on the "opening button" in front (this button and the self-hiding magnetic latches were removed on the unibodies).
That bar is actually a series of those small holes to let the light through. The green light for the metal casing came later IIRC.