Some cute ideas for a divider wall include using stacked bookshelves or a bookcase, hanging a decorative curtain or using narrowed walls. These ideas provide decor for large rooms and separate them into different sections.
To create a divider wall that completely blocks each space for more privacy, use a tall and narrow bookcase. This provides extra storage and clearly separates the space. This technique is ideal for large bedrooms that are being used for more than one child; however, be sure that the bookcase is secured and does not present a tipping danger.
For another idea, hang curtains from the ceiling where the dividing line is located. Open the curtains when the spaces don't need to be private.