1. useful :http://www.thingiverse.com/thing:42948
I think this iPhone case is pretty useful. It protects around the side of the iPhone and has very beautiful design in the back.
2. artistic/beautiful :http://www.thingiverse.com/thing:23716
It is a beautiful building design. It looks very complex.
3. pointless/useless :http://www.thingiverse.com/thing:42249
I think this is useless. We don't need a 3D recycle symbol.
4. funny/weird: http://www.thingiverse.com/thing:42947
A funny design, but it is cute.
This is a strange design. A little bit scary too.
I believe I am a tinkerer when I was younger. As I grow older, I become less a tinkerer and more interested in computer and other electrics. When I was in high school I receive a present which is a helicopter toy. I really like it and play with it a lot. At that time, I was very amazed by how a small object is able to fly around in my room. However, there is a problem the helicopter toy only work indoor. If I try to play with it outside, it will loss control. Because I like it so much, I start thinking about solution to play with it outside. Finally, I found a solution which is build a paper boat and attach the helicopter on the boat, and then I can move it on the pond in front of my house. In addition to the "boat", I put duct tape around the bottom of the boat to make it waterproof. I was very proud of my design and spend a lot of time playing with it.
I agree with the idea the article is trying to present. I think tinker in a way present a sustainable method for designing a product.