Allow students to work independently or in small groups. Provide legos and base plates for student use. Differentiation may include the chance to design the entire room, or just the toy box. Students would have an opportunity to visually present, or just set up the model.
I plan to allow the students to design and build their toy boxes to scale. I would model using legos (and legos could be provided to them for use as well.) They would have an opportunity to layout the entire bedroom (to scale.)