autumn background brown fall fallen grass leaf leaves natural nature russet tawny texture yellow bear cute green grey koala Planckendael sleep sleeping zoo amber England oak Quercus red rust Sussex tree black boy bud bush curly dead drought dry flower bud textures vegetation color colour gold maple orange pattern plant ray sun beauty center continuity evolving fern gradually growing leafs regenerating rotation spiral spores autumnal grassy lavender lavenders leafy season seasons abstract covered ground woodland cycle dried faded life wilted withered beech copper Fagus fresh purpurea spring sylvatica young