Each of your books is priceless and you want to preserve them in the best condition possible. But it is not always so easy, especially if you do not have a proper bookshelf. Now bookshelves do not come cheap, be it a simple plywood one or an ornate wooden case. So, here are forty simple yet trendy DIY bookshelves for you and your books. DIY bookshelf ideas work best when you are on a budget. Not only that, you might probably be able to put to use some of your favorite antique or old pieces of furniture or things to better use.