Got a room with zero closet space? An Ikea Billy bookcase might be all you need. When blogger Rachel Denbow and her husband found themselves living in a one-bedroom apartment after their first son was born, they had a lightbulb moment and outfitted a single Billy with a rod and hooks. The unit's adjustable slide-in shelves make it easy to change according to new wardrobe needs. Another thing that's great about this? You can move it to any wall or area of a room, any time.