It is so called "waffle pattern trivets," that is, lattice design, and it is quite. Simple and beautiful, these crosscut teak trivets reveal intriguing patterns of growth rings, each representing one year in the life of the tree.
Here is an easy project that you can make using plywood scraps. Build a simple but effective wooden trivet for your kitchen. At the link you will find a free woodworking tutorial on how to build it. All four wooden trivets proposed here are made of a single piece of wood.
I built a set of simple scrap wood wooden trivets using two methods: first, using " traditional" woodworking. Trivet free project.
I made a fun and easy wooden trivet that took about minutes to make. Maple would have worked better to not. Next cut out the veneer tape to your desired patterns.