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.
Sans the branch and crystals, ideal for lighting the dome. vintage wooden ladder makes great lighting! This one is wrapped with globe lights, and decorated with vintage chandelier crystals and branches. There are endless variations on this theme!
Kitchen or anywhere DIY. Seems simple enough, depending on your gap between shelves, anywhere from ropes to ropes for your spacing. You could even use wider wood, just adjust your rope length to accommodate your width and height of your shelves.