1. Begin by selecting as round a pumpkin as you can find. Cut off the top, and scoop out the inside pulp and seeds. Inside the pumpkin, place a plastic paint bucket or any plastic container that fits easily.
2. Place a cube of Oasis floral foam inside the container, thinning it to fit. Press the foam down to make it level, and drench it with water (enough so that a small pool collects at the bottom of the container). Arrange seasonal flowers, dried leaves, and berries as desired.