abstract backdrop background color colorful colors colour colours dot dots halftone hues pattern series shades spectrum tone tones variation variations art artwork colourful decoration decorations design mosaic ornamental ornaments structure structures texture textures tile tiles wall paint patterns regular shape shapes silver stripes symmetric triangle triangles triangular turnery bright clean decorative elegant element industrial lines metal metallic modern New panel appearance grains grainy impact impacted rain rain-drops rain-spatter sand spatter spattered surface surfaces backgound blend experimental gradient hue shade graphic grunge grungy paper rough rustic scraps