bark blur blurred brown gap gaps green nature saavem surface texture tree trunk wood abstract background beams concept creation decking design fence fill floor graphic illustration image indoor lines original outdoor pattern planks render scrapbooking slats style timber unique vector wall wood grain bird's eye forest germany Harz pinery thick view board decay Dirt dirty door old paint painted painting plank red rusty urban angle Cromer perspective pier planking weathered wooden grunge lumber rust rustic