abstract backdrop background black concrete design gray grunge grungy natural natural texture nature pattern rock stone texture textured urban brown dark decay fence gloomy planks stripes wall wood blue border flat fresh grass green landscape plain rural sky summer sun sunny background. backdrop desk fold folded frame letter office old paper wallpaper write writing yellow drawing graphic heirloom illustration painted patch patchwork repetition retro shape similar stiched stitches block blocks color colors colour colours grid hues mosaic series shades tones variation variations various hue paint paints shade textures tone watercolor watercolors watercolours