Make it Personal
If your child is moving from the nursery into a shared room with a sibling, make sure to divide the space with well-defined areas for both children. One great way to do this is to split the room in half, painting one side one color and the other side a very different color. It may be a designer nightmare, but it could diffuse territorial issues later. Getting both children to choose their colors and participate in the design process helps, too. Kids can't always have a room of their own, but no one ever said that sharing can't be a fun, positive experience.