Countless designers, artistic similarities. Here are several trends for Spring|Summer 2015 from New York Fashion Week.   Runway Spotlight: Bouquets of Flowers Carolina Herrera | Dennis Basso | Monique Lhuillier       Runway Spotlight: Black|White Brushstrokes Sally LaPointe | Donna Karan | Ralph Rucci         Runway Spotlight: Patches of Sheer Lela…