Cover the table with a blue tablecloth, which will establish blue as the base of your color-scheme and will also protect the table against staining or damage.
Tie a black trim around the border of the table so the black and blue are blended together.
Place silver salt and pepper shakers and silverware at each of the place settings on the table if people will eat there. Use silver platters and plates for any food items that are placed on the table.
Place folded black napkins under the silverware. The silver will stand out more against the black background.
Tie black, blue and silver balloons to the backs of the chairs around the table. The balloons will help frame the table and further enforce the color scheme.
Place a black or silver basket in the center of the table, and fill it with blue, black and silver decorations, such as tinsel, ornaments or crafts.