There is much available furniture that represents nature. Every piece of wood or stone is surely a natural element. If most of the furniture at home is made of wood, then it creates the feeling of being in the woods with the nature directly embracing a person. Colors are very important because if one really wants to know how to bring the outside in, every element inside the room would complement each other. Earth tones such as yellow, green, red, brown, and orange are usually used and they really give a soothing effect to the entire room.
Aside from that, landscape design would be a better idea for bringing the outside in such as fountains, gardens, or ponds. It is like being out in the park or in the woods but one is just inside the room or the garden, and he gets to have the complete experience even without getting out.