backdrop background bar blue bright brilliant color colored colorful colors colour coloured colourful colours construction glare gleam glow glowing irregular light metal metallic plate reflections regular shape shapes shine shining shiny steel structure structures texture textures orange silver abstract appearance brown coloring colouring contours contrast contrasts cracks fissures flaws grit gritty layered layers levels lines natural ribbons rock rock-face rockface rocky rough rugged sandstone sandy shade shades of color shades of colour shadows shaped stone strata stratum sunlight sunny sunshine surface surfaces textured veins wallpaper