gray metallic color/black and white gradient background. use for app, postcards, packaging, items, websites,app and material

abstract alloy app art backdrop background banner beautiful blur blurred bright business colorblack concept decoration design elegant frame gradient graphic gray grey icon illustration iron items light machine material materialillustration metal metallic modern monochrome packaging pattern postcards retro shiny sign silver smooth soft stainless steel style surface technology template text texture use wallpaper websitesapp white