Idea for area under stairs - Turn a hallway into a makeshift mudroom: If your home doesn't have a designated room for storing shoes, coats, backpacks, and the sort, built-in storage in your entryway will do just fine and make better use of the space.
From old door to beautiful catchall. Add some shelves or wire baskets as this one shows. I love the addition of the mirror! You can find directions for how to build something similar from This Old House New Takes On Old Doors: Salvaged Doors Repurposed