
When Lanvin opened its New York flagship store on Madison Avenue in 2010, the fashion house threw a colorful bash that drew decor ideas from artistic director Alber Elbaz's whimsical sketches. Outside, producers covered the facade with an oversize drawing and framed it with hundreds of colorful balloons.
Photo: Liz Brown Photography

To kick-start holiday shopping in November 2011, Barneys New York turned its flagship store on Madison Avenue into Lady Gaga’s Workshop. The custom 40- by18-foot truss that marked the entrance was completed overnight in preparation for the midnight opening.
Photo: Neilson Barnard/Getty Images for Barneys New York