abstract appearance Australian background bare bark brown colors colours cracked cracks dry edge edges eucalypt eucalypts gray grey grooves layers lines mottled peeling rough self-shedding shadows shapes shedding smooth sunlight surface texture textured textures tree tree trunk trunk uneven variations wallpaper wood aging backdrop botanical close closeup design detail garden light macro material natural nature nobody old organic outdoors palm paradise pattern plant rugged stem travel tropical vertical wall weathered wooden cambodian close-up pitted surfaces tree-trunk