Need more space? Got a dingy unfinished room? You can quickly transform that space into something usable and comfortable. We take a closer look at it as well as some alternatives. Tween Girls Bedroom Decorating Ideas Teenage Girl Room Decor Ideas Teenage Room Ideas For Your Bedroom Model is one way to turn a dingy unfinished room into additional space that's attractive and comfortable. It does this by applying their expertise in building science and system design to the standard below-grade home design.