One way to make an ice sculpture is to fill balloons of various shapes and sizes with water and allow them to freeze after arranging them in creative designs, then once the water is completely frozen, peel away the balloons to reveal the ice sculpture. It is important to include a few grains of sand in each of the balloons before adding the water. The sand acts as a nucleus for the water and ensures that the water freezes throughout.
A fun variation on an ice sculpture is to add food coloring to the water before putting the water in the balloon. Food coloring can also be added to the outside of the ice after the balloons are removed to color just the outside instead of completely through the ice. Some more intricate ice sculptures include Christmas lights underneath the ice to create a beautiful effect when the lights are turned on at night.
For a smaller ice sculpture, use flexible silicone molds and fill them with water. Place the molds in the freezer. Once the water is frozen, remove the silicone mold. Several molded pieces can be fastened together by sprinkling ice shavings and water between two flat surfaces of ice.