Exploring thingiverse.com, I found some interesting creations.
Something useful: Shotgun/bottle Opener
Something useless: The Cat Bus
Something beautiful: Thayer Vase
Something funny: Stegosaurus Dinosaur Costume
Something scary: Goey Monster
I would consider myself a tinkerer, as an engineer this is an important skill to have. Many of my friends are engineers as well, so I would consider most of them to be fellow tinkerers.