abstract appearance backgrounds bark bumps close-up colors colours cracks edge edges layers patterns ridges rough shades of colour smooth strips surface surfaces texture textured textures tree tree-trunk trunk uneven variations varieties wallpaper wood brown tree trunk backdrop background black blinds concept creation design duotone fade fill gradient graphic gray grey illustration image light lines monochrome neutral New original paper pattern render scrapbooking stripes style unique vector vertical white Australian melaleuca rhaphiophylla melaleucas myrtaceae paper-like paperbark peel peeling useful