The holidays are over, but you can still grab a bit of the season’s magic from New York’s Saks Fifth Avenue. Through Jan. 5, the department store is running an online auction of the one-of-a-kind dresses seen in the flagship’s holiday windows. Based on the store’s “bubbles and snowflakes” theme, the gowns were designed especially for Saks by Stella McCartney, Proenza Schouler, Nina Ricci, Olivier Theyskens, Rag & Bone and Erdem (left). The dresses are available for auction through Thursday at charitybuzz.com, and proceeds from sales benefit St. Jude Children’s Research Hospital. It’s one final way to give back this season — while giving yourself a gift for the new year.