blue grunge backgrounds collection

abstract aged background backgrounds blemish blob blobs blot blots blue border brush burned chalk colors copy crack cracks damaged dark design dirty doodle dot drawing drip edge frame grunge grungy halftone image ink knot layered messy net nets old patterns retro rustic scrap scrapbook scratch scratchs set shape silhouette sketch space spatter splat spot stain stains texture textures thread unclean vintage worn