aged alert area backdrop background blank bolt bolts brown copy fence grunge grungy icon industry inform information isolated metal old paint painted placard plank planks plaque retro risk rust rusty sign space square steel texture triangle wall weathered white wood wooden yellow abstract art blot blotch blotches clip art clipart graffiti graphic illustration ink liquid red splats splatter stain blue black alarm danger dangerous death electric electrical electricity green hazard notice peeling warning canvas color colors colour colours distorted distortion hues pastel rough shades tones wave waves wavy hue pastels shade spatter tint tints tone