Tip: Mix grown-up pieces into a child's bedroom. This bedroom was designed for the couple's 3-year-old son. "I am not a fan of 'themed' rooms for children. Having one myself, I know how quickly their interests can change," Meisels says. "Rather, I like to integrate very adult elements into the design of a child's room, like the upholstered custom-made bed, with fun patterns, colors and shapes. We chose robot wallpaper, but stopped short of a robot rug and robot bedding. I think the mix of a little of this and a little of that ultimately will last longer as the child grows."Desk: VintageBedding: IKEA and West Elm (throw and cushions are custom)Rug: Madeline WeinribNightstands: Crate and Barrel