5 Minute Pumpkin Centerpieces Use 5-6" pumpkin & cut 4" opening on the top. Don't bother taking out the seeds. Fill with a small amount of 'soil'. Take fall 'mums' out of planting pot & place them in the soil. Now add (Dollar Store) fall 'leaves' as fillers. Water your new centre piece. If water seeps out just let it drain a bit.