Look for dead space under stairs and in deep walls. There is often room under a staircase for a small closet, powder room, or even built-in shelves for cataloging books, files and other knickknacks that create clutter.
Desk area for girls room - You don’t need a gallon of paint to make a bold statement. Instead, target a small architectural detail, like the reclaimed brackets supporting this DIY desk. Do a corner desk
Master bathroom idea-Removing drywall and putting in a handy storage shelf. Another good idea if space is sort of tight and you want to display things instead of using a curio cabinet. You could add a door/doors if you wanted the items protected.