Lay the pineapple on its side on the cutting board.
Hold the pineapple firmly and cut off the stalk. If the pineapple is unsteady when set on its end, remove a portion of the bottom of the pineapple to create a flat surface.
Stand the pineapple up and insert the knife at the top, a few inches from the outer skin. Turn the pineapple around in a full circle as you cut. Use a large scoop or spoon to dig out the fruit.
Insert a glass, vase or other cylindrical container into the pineapple so it doesn't show. Set the pineapple on a plate if there's any juice seeping out.
Fill the vase or container with water and insert your flowers. Arrange them any way you like.