angle angles appearances architectural architecture brickwork building city closed cracked cracks dark decay deterioration Dirt dirty discoloration discolouration disrepair elements exterior external grime grimy neglect neglected old open peeling paint unsafe urban decay windows abstract alongside bark brown colors colours connected curved danger exposed grained gray grey grit natural nature outside pattern peeling Roots rough rustic surface surfaced surfaces textured textures tight timber trees trip-up wood aging background concept creation design fence fill graphic green grunge illustration image industrial metal mottled oxidisation oxidised paint purple ruin rust rusted scrapbooking style texture ugly unique urban vector weathered blue violet corrugated black red pink appearance Australian bumps close-up layers melaleuca rhaphiophylla melaleucas myrtaceae paper-like paperbark patterns peel smooth strips tree tree trunk trunk uneven useful variations