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 Tweens Bedroom Ideas Tween Bedroom Revamp The Creativity Exchange 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.