Simple built-in to create a mudroom and/or storage anywhere from an entry, to kids room or in a laundry room by adding shelves or a deeper bench for sitting. Put drawers under bench or have the seat lift up to store things.
Old doors as room divider,why not? Maybe between kitchen and either dining area or living room.does not divide the whole room.but makes a good separation.and I do love the Old Door! (For closet area in master bedroom)