backdrop background canvas colours dots grunge grungy paint painting paints pattern red rough rustic series spatter texture variations vintage yellow abstract angles appearance architectural architecture brown color colors colour contrast contrasting corrosion corrugated corrugations dark decay deterioration elements external metal old perspectives rust rusty surface surfaces textures uneven wall wearing weathering hue hues pastel shades speckles tone tones various brush Incomplete started stroke strokes unfinished cotton fiber fibers pastels stuff stuffing variation patels shade soft tattered