unobtrusive header with colorful modern soft swirl waves background with dim gray, very dark blue and dark gray color

unobtrusive header modern soft swirl waves colorful abstract background dim gray design dark blue tones smooth wave pattern elegant digital art flowing lines subtle gradient highquality minimalistic texture fluid motion graphics contemporary wallpaper curved shapes stylish banner artistic composition professional web sophisticated dynamic color blending futuristic creative backdrop gentle effect aesthetic curves transitions flow sleek refined artwork harmonious blend trendy fluidity decorative swirls movement versatile polished