Use one door as the back, and several doors cut up to make shelves, sides or a storage section.
Paint, finish or upholster an old door and hang it above the bed for a fresh, easy to relocate headboard.
3. Coffee table:
Find old table legs, use all or part of a door for the tabletop and cover it with paint or finish.
Use French doors with the glass removed to create a trellis for climbing vines.
5. Room divider:
Join several French doors (preferably matching) with hinges to create a Japanese-inspired room partition.