These designs you see here aim to incorporate more wood and thus make them a bit cheaper as you can use recycled pallet wood that is so abundant everywhere.
They are very simple to make, basic tools and basic skills required to make these. It is more about the originality of the design then it is about sophisticated materials and advanced skills, it can be done by anyone.
Now, these are bit more complicated, but the effect is stunning. To achieve this bent wood you would need a steam device that you would heat up the wood in and then bend it to the shape you are looking for. This device can be bought or made-look up Youtube for instructions if you are interested.
That is really cool, I guarantee to get some jaws dropped when people see this the first time.