There's little debate as to whether or not design exists in nature. There is abundance evidence that it exists, the argument surrounds the mechanism of design and whether or not it was purposeful.
From my perspective design does not come without specificity and specificity is a condition that is anything but expected. (Note that the specificity that I am referring to can be expressed in the laws of physics, and or in the way biochemical compounds interact, as much as how higher level biological concepts such as genes work together.)
In this article, you'll read about the advanced light manipulation mechanisms found in diatoms.
"Nature started to evolve complex colour and light manipulating systems during the Cambrian explosion - about 500 million years ago. Scientists have been inspired by the natural systems that are found in wide range of organisms - including peacocks, butterflies and beetles. These single-celled marine algae are found in almost all aquatic environments on Earth.
They come in all shapes and sizes - but are all encased within silica-based walls that are well known for their intricate designs."
