abstract backdrop background blue cold cool design flake gradient graphics line lines modern ray rays snow star vector winter Asian curve illustration japan nature repetition retro sea sky sun sunlight sunshine water wave waves bolts colour colours engine industrial industry metal objects railway rough shapes textures train travel yellow beast dragon fantasy fractals grape leg monster ocean octopus red seize texture underwater decay metallic object rust rusting rusty stripe stripes urban decay weld welding art blot blotch blotches clip art clipart graffiti graphic ink liquid paint splats splatter stain brown pattern silver Still life photography urban