“Involve teens in the design process. That’s the lesson Boston-based Andrew Terrat of Elms Interior Design learned when he designed this room for the teenage son of a client in Wayland. To his surprise, the boy and his two sisters, whose room Terrat also designed, were really interested . They sent him links to pieces they liked, having shopped it all online. The PB Teen Vintage Camo Quilt was one of the client’s son’s finds, as was a set of skateboard shelves.”