PARIS — He’s the most influential designer around at the moment, and Nicolas Ghesquiere’s spring collection for Balenciaga demonstrated exactly why. He offered a brilliant combination of the dramatic and the casual, often with exotic touches that suggested the denizens of a harem. Elaborate print collages were used for dresses and tank tops, while pants, skirts and dresses came in pale green or pink crinkled rayon. Here, a leather vest over a vibrant scarf-dress. For more on the season, see pages 6 and 7.