a vibrant 4k gradient background blending rich hues of purple, pink, and blue with a subtle grainy texture. perfect for modern

background grainy wallpaper blur banner backdrop waves gradient abstract purple pink blue vibrant texture design smooth flow digital art desktop screen minimalistic modern vivid pattern soft stylish elegant decor visual creative wavy motion highresolution aesthetic artistic sleek luxurious sophisticated blending rich hues subtle texture perfect wallpapers banners backdrops