Here are a few ideas is you have some old doors that you would like to recycle:
Folding screen Make a useful screen by hinging three lightweight, narrow, plain or louver doors together, and then decorate it with paint or wallpaper as desired.
Emergency bench Lay a solid door on top of concrete blocks or trestles to make emergency seating or a simple, outdoor table.
Desktop Flat, solid doors provide a sturdy surface for computers, typewriters and other large or bulky equipment. Set the door on top of two filing cabinets of matching height. Placed on a pair of trestles, it works well for pasting up wallpaper.
Table extender Enlarge a small dining table by placing a flat door on top. Put a pair of thin rubber gloves on the table first to keep the door from sliding off its base.
Temporary path After a heavy rainstorm, lay old doors over soggy ground for easy walking.
Tree house If you have a large garden with a suitable tree, nail together several old doors to make a tree house for the children. Or you could make a smaller, freestanding Wendy house if you have no trees.