abstract appearance background brown colored coloring colors coloured colouring colours conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light lines mica natural rock rock-face rockface rocky rough rugged shade shadows shape shapes silicate stone strata stratum sunlight sunny sunshine surfaces texture textured textures veins wallpaper backdrop beam building construction copy dark design desk floor furniture grain graphic groove. grunge grungy hardwood illustration industry knot knotted mahogany maple material medium merchant oak panel pattern pine plank polish red redwood space stain stripe timber tree vector wall walnut wood wooden shaped surface