dark deep indigo alcohol ink neon abstract background. bright glowing flow blue liquid watercolor paint splash texture effect illu

abstract alcohol aquarelle backdrop background banners black blue bright card color cosmic dark deep design effect energy ethereal flow fluid fog galaxy glow glowing gradient graphic illustration indigo ink light lightning liquid modern nebula neon night ombre paint shade sky smear smoke smooth smudge soft space splash stain star steam storm texture universe water watercolor watercolour wave