Draw an outline of a pumpkin on cardboard, posterboard, or heavy card stock.
You can also print out any of these black & white pumpkin templates on A4 or Letter size cardstock.
Continue adding seeds until you've covered the entire pumpkin. Use a popsicle stick or small spoon to move and arrange the seeds, filling in as much of the gaps as you can with seeds.
Once you've filled the entire pumpkin with seeds, let the glue dry completely.