audio ball button circle dots grill grunge holes metal music pattern reflection retro ring round rust rusty sound Speaker vintage abandoned abstract aging aqua background blue brown color colours concept decay design fill graphic illustration image industrial old orange oxidisation oxidised paint purple ruin rusted scrapbooking style texture ugly unique urban wall weathered erode erosion gouge industry oxidation oxide scratch speckle speckled surface wear worn aged boxcar iron oxidized peel peeling rivet rivets seam steel colored flotexture green joint multi plug red riveted row single violet welded yellow backdrop colour grungy hues rough rustic series shades tone tones variation variations