Dave - I don't know of any representations available. I tend to think that other than the patrons, no one else would notice their absence. That being said, I have made them and added them to scenes. For plates, I took a brand new single-edge razor blade and carefully sliced very thin cross sections of white sprue material. Not all of them came out successfully, so I made lots of extras. Silverware can be represented by tiny pieces of silver wire; I got mine by unraveling recycled computer wire. Cups and Styrofoam type drinking utensils can be made from some .020 or .030 styrene rod from Evergreen, I cannot remember which size that I used. I haven't made any clear glasses, but there may be some fiber-optic wire of the correct diameter that could be used.
Unless I point it out to others, no one seems to see them in enclosed structures anyway.
Hope that this helps.
Willie