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 ancient art backdrop banner beige blank canvas concept creative decay decor design dirty fill graphic grunge illustration leather manuscript map old paper parchment pattern poster retro scrapbooking sepia skin stained stationery tissue vector vellum vintage wall