We have already featured on Recyclart a lamp made from an old pair of crutches. Here's another idea of crutches upcycling by Mamie Jane's, she used a pair of them to make a new shelf in a vintage style.
bookshelfporn: DIY Ladder Bookshelves To get this look, all you need are two ladders and some wood planks. Paint the ladders and the wood if you want, then slide the wood planks through the ladders so they are resting on the ladder steps.
Driven By Décor: 25 Unique Ways to Decorate with Vintage Ladders--some good ideas include using ladders in room corners, using in closets for more storage, using in outdoor decorating (plant stands, etc.), placing over top of 2 nearby bookcases.