dark blue seamless geometric pattern. purple sharp s on dark back. fantasy mystic ornament

psychedelic background monochrome decorative ornamental geometric rhombuses wallpaper triangles repeating seamless ornament abstract esoteric mystical pattern fantasy textile unusual polygon graphic drawing texture vintage element corners purple shapes mystic mistic strict design ornate square vector linear mosaic modern zigzag spikes effect sharp decor lines rhomb shape dark blue back tech grid rays art