abstract angles appearance backdrop background bracken coloring colors colouring colours cool droplets drops fern fern-tree ferns flora foliage fronds green greenery shade shapes spread spreading sunlight texture textures tree-fern variation vegetation wallpaper black brown browns contours cover dips exterior grooves hard horny plates layers lines outlines pointed points protection rough shell shelter sides solid strength strong tips tortoise tortoise shell tough white appearances arid Cacti cactus clumps clusters display edge edges garden garden-display garden-plants irregular leaves light ornamental perennials plants shape succulents surface surfaces unusual