abstract backdrop background collage grunge grungy montone paper papier rustic series shade shades stained texture textures tone tones variation variations color colorful colors colour colours glass hue hues pattern tint various bar bars blue cross galvanized geometry gray grid iron matrix metal regular regularity shadow sky steel zink appearance blended bright colored coloured colourful decorative design details distinctive fine geometric geometrical green interconnected intermeshed interwoven light linear lined lines linked links mat patterns perspectives style textured thick thin vibrant wallpaper