The Nvidia one looks quite a bit nicer than your average eBay ruler though... full 12", two color silkscreen, ENIG finish, and some crazy tiny-pitch BGA footprints. The component layout is also not haphazard like most of the other rulers I've seen; it's much more of a work of art.
I assure you, that is not a two-color silkscreen. The green NVIDIA 'eye' logo is much more likely a second manufacturing process (confusingly also a silkscreen or pad printing process) that was done after the boards were received from the fab, or drop-shipped to a screenprinting company.
I would be very, very surprised if the green eye logo was done in-house at the fab.
I definitely want one.