The boards outside of big office blocks usually have engraved nameplates for all the companies using the offices. We have just created an office name board using clear glass like acrylic with the details printed on vinyl and applied to the reverse. These are held away from the beautiful oak backing board with stand-off fittings.  The effect is a quality name board with much more up to date look about it.  http://www.sign-maker.net/vinyl/acrylic-glass-full-colour.html