I like the idea of putting drapes on the walk-in closet in the master bathroom. Make them match the drapes in the bedroom, and tone in with the wall colour. NOTE the ceiling pot lights within the closet space
Four wall-mounted drying racks in a mudroom create an instant indoor drying room; recreate the look with four wall-mounted racks from Ikea. For something similar, consider Ikea's wall-mounted Grundtal Drying Rack;
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.