The shelf in the first picture is made of red oak plywood. You can choose the wood type, color and design as you like for your project. In case if you need more help understanding this project, you can refer the source link below. It discusses various items used, steps and tips and personal experience of the author who personally built a Zigzag shelf.
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Here, I am writing about another DIY project that involves the use of an old furniture piece. I think that the idea of reusing and recycling old furniture has got to me. Anyways, I am starting to love it. This project involves using an old door to build a beautiful multi picture frame, as you can see in the image below. This frame looks really wonderful and can be used to hold many pictures at a time.