A minimalist, moody abstract painting for an audiobook cover. Dominant colors are deep, desaturated blues and greys, with subtle hints of a muted, warm amber or ochre glowing from the center. The texture suggests aged paper or a slightly worn canvas. The composition features a central, blurred vortex or ripple effect, symbolizing echoes and memories. The overall atmosphere should be contemplative, slightly melancholic, and mysterious, evoking a sense of introspection and a connection to the past. Square 1024x1024 format, professional audiobook cover aesthetic, no text.