Staircases take up a lot of space, so why not use them for storage as well. Imagine each step is a box with a hidden drawer in it still allowing for additional storage or home office space beneath the staircase.
Walk-in closet/laundry room? Clean clothes go straight from the dryer to the drawer in this walk-in closet, no hamper required. For efficiency, the homeowner opted for stacked machines and a built-in dresser that also serves as a folding table.
DIY Cardboard furniture That doesn't look like it's made from cardboard! We've had some great posts on cardboard furniture you can buy that doesn't LOOK like cardboard, but most DIY options resemble the brown recyclable stuff.