I too would use the wine glasses.....maybe three to a table on a mirror.....Blue tinted water, accent of the grapes, Place a red and/or white white germini below the glass rim. - On the mirror itself, one or two clusters of grapes, two or three germin blooms in water vials nestled in the grape clusters.
WHen you said a wine dinner.......sounds to me like more of a wine-tasting.....that was the important clue for these designs.
---------------------------------------------
Now, if they decide to up the dollars........then use four glasses, 2 with red germin, 2 with white germin, and place a square of clear glass on top of the glasses, then drape some grapes and a few blooms off the glass.