cool-toned abstract geometric background in 4k with grainy textures and shades of blue and green. ideal for tech-themed, modern

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