The background can feature a large tree with lush green leaves and branches, standing tall on a vast field of green grass. The background can also show the tree in different seasons, such as the fall, with the leaves changing colors, or in the spring, with new leaves and flowers blooming. The background can also include other elements such as a blue sky, fluffy clouds, or a small stream flowing nearby, which can add a sense of life and movement to the image. A beautiful tree on a field can make an incredibly serene and natural background for a Facebook page.