abstract background bare bark black brown colors colours dry gnarled gray grey grooves layers lines mottled peeling rough shadows shapes sunlight surface texture textured textures tree tree trunk trunk barley crop farm food green health healthy nature organic wheat crystal crystalline crystals feldspar grain grained granite Mineral mineralogy plagioclase quartz rock backdrop blue decay detail metal ol rust rusty silver urban burn burned color colour grunge grungy orange red bolster bright curled curly cushion fabric fiber fibre pink soft synthetic violet cold design ice icy wallpaper winter