In the Westchester, New York, home of designer Katie Ridder and architect Peter Pennoyer, their daughter resides in a dreamy oasis infused with springtime colors.

A custom-made window treatment hangs above a headboard designed by Lisa Fine, the bedding is by Leontine Linens, the lacquer bedside tables are by Bungalow 5 and the striped carpet is by Paul H. Lee Carpets & Rugs.