Hi Joyce! I recently saw a cabinet/pantry that had a vintage screen door. Without seeing the screen door, that would be my best suggestion.
Attach a heavy wire to the wood on the back of the door. Hang a lovely seasonal garden wreath on the screen part of the door, and place the completed door on a long wall in your guest room. Paint the wood a color you love, and enjoy the compliments you will receive from your guest.
As stated above, attach (chicken) wire to the back of the door. Attach wood behind that (painted a contrasting color if you wish). With sturdy hinges, attach it to the wall horizontally. Add straps of leather to the wall and down to the wood you attached. Attach some flat decorative items to the wire. Now you have a fold away desk that is decorative when folded up.