Snow Crystals:
The detailed geometric shapes make the whole crsytal flakes fascinating to look at. In my mind, There's a lot of snow flakes with massive geometry floating in the space.
Falling Leaves:
Falling leaves is like floating snow crystals. The shapes of the leaves and the veins of them create the theme of Autumn.
Water Splash:
When something (or water drops) dropped into the water surface, the splashes they created vary a lot due to the differents of the size of the object, the velocity it drop, etc. But yet the shape of the splashes are really great to look at.