Finishing touches. Furniture, plants and other outdoor accessories bring the best of modern life outdoors. Organize plants in a container garden that adds color and structure to the deck and can be used to flank doorways and stairs. Extend the use of your deck throughout the year with a chiminea, freestanding fireplace, fire pit or outdoor heaters powered by electricity or gas. Outdoor heaters can range from small, inexpensive tabletop units to larger, more costly freestanding gas units on wheels, allowing you to move them to where the heat is needed most.