dark blue abstract geometric background in 4k with grainy textures and smooth gradients. perfect for tech-themed wallpapers,

background grainy wallpaper blur banner backdrop abstract geometric gradient blue dark tech minimalistic texture design digital smooth creative trendy overlapping polygonal modern stylish vibrant bright light futuristic art artistic contemporary triangle energy dynamic visual colorful digitalart softfocus elegant spectrum sharp bold pattern textures gradients perfect tech-themed wallpapers backdrops banners