background erode erosion gouge grunge industrial industry metal old oxidation oxide paint rust scratch speckle speckled surface texture wear worn abstract arachnoid arachnophobia backdrop black concept decorative fantasy gossamer graphic halloween illustration spiderweb spooky style vector web white aged border frame grungy line lines paper papier rough rustic series textures variation variations variety various canvas colour colours fabric hues pastel pastels shades art color colorful colors painting paintings paints pattern tones spatter spatters splatter splatters hue shade tone