abstract backdrop black brown decay design eight grunge grungy letter metal background number oxide plate plates rough rust rusty sheet speckled steel textural texture textured textures urban weathered white arts ba1969 background collage crafts metal paper rustic scrapbook scraps series surface tattered torn worn aged aging chemical corroded corrosion damage damaged dirty distressed ferrous frame hull industrial industry iron macro metallic old oxidation paint peel peeling pitted reaction red retro rusted scrap stain stained weathering