Here are the directions for tackling this look for your bar:
Place a full bottle into a fully opened cardboard half-gallon milk carton. Insert flowers or thinly sliced fruit (we've used nasturtiums, lemons, and limes) around the bottle, filling one third of the carton. Pour water into the container, just covering the fruit and flowers. Place the carton upright in the freezer. When the liquid is completely frozen, add another layer of fruit and very cold water, and freeze. Repeat, filling and freezing a third of the carton at a time, which prevents all the fruit and flowers from floating to the top until the water reaches the bottle's neck. Remove from the freezer when it's time to serve the vodka: Cut away the milk carton with a utility knife; wrap a dinner napkin around the bottle's base, and serve the vodka with slices of lemon zest tied in knots.
Images via Martha Stewart