His technique, now known as Necmeddin Ebru, involves the careful placement of paint droplets to form stems and petals. He used ox gall and natural pigments to control how colours spread across the thickened water. His work is defined by its precision and the balance between the fluid medium and the structured anatomy of the flowers. He often combined these marbled images with classical calligraphy.

Modern collectors value Okyay's work for its organic geometry and calm aesthetic. The botanical subjects provide a link between traditional Islamic art and Western natural history illustration. These prints offer a sense of order and natural beauty that suits contemporary interior design. His ability to capture a single tulip or a spray of roses in a liquid medium remains a technical feat for those interested in process-driven art.