abstract Asian background blue curve design illustration japan nature repetition retro sea sky sun sunlight sunshine water wave waves black graphic hypnosis op art optical illusion round scrapbooking spiral swirl texture white border confetti day field frame fun happy joy polka dots seasons sparkle spring stripes summer C4U ChIandra4U dark decor decoration draw drawing grey invitation sad sadness soft vector aqua burst calm concept element fill gradient paint pastel sunburst 3D art blank circles cluster decorative event pattern color colours lines orange red seamless spaghetti tile wavy yellow pink purple animal bats cloud clouds halloween house light lights moon season spooky star stars