abstract background board decay Dirt dirty door old paint painted painting plank red rusty saavem texture urban wood blue grunge iron metal metals oxide rust rusted rusting steel structure wheathered big construction corrosion heavy huge nut nuts thread threads tool tools diamond free image peeled photo plate stock weathered bolt bolts cage grill machine machinery mesh Nuts and Bolts textures weld welded welding black burst chap crack fissure fracture oil paint pattern split tin tinware white backdrop dark design gloomy grungy metal background plates rough sheet speckled textural textured cut dust dusty gap gaps handsaw nature pile power saw sawdust tree trees trunk