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.
This particular tray is made using reclaimed barn wood but the author of the project Beyond The Picket Fence surprised everyone with one fact: reclaimed barn wood has often some areas turned pink due to cow urine. If you check the project more closely, you’ll also notice some areas of the tray being almost bright pink. That’s something you don’t see every day!
You can also use Google image search to research a project. Unlike the PDF search, the image search provides a photo of what the project will look like, which is helpful in determining if you want to pursue building it. By doing an image search for how to build a step stool, you will have a ton of options that all lead to woodworking plans of various quality. (The how to part of these is important—otherwise you’ll just get pictures of step stools.)