a geometric 4k abstract background with dark gradients blending green, purple, and blue hues. the sharp s and grainy texture

background grainy wallpaper blur banner backdrop abstract geometric color gradient texture highresolution digital art design green purple blue moody dark sharp shapes angular modern smooth sleek creative polygonal intersecting trendy dynamic artistic vibrant professional stylish futuristic graphic contrast contemporary expression bold highquality visual impact clean lines sophisticated dramatic gradients blending hues create feel