Mechanical Colors

It seems we're headed towards a future of mechanical colors. Most of the colors that we are used to, particularly paint colors, are produced in chemical processes. Or we use natural materials that have an innate color, such as earth colors. But in the last few weeks alone, three breakthroughs have been reported on the production of non-chemical colors:
Color-changing graphene bubbles to create ‘mechanical pixels’
Changing the color of your clothes on a whim
Bright colors by nanotechnology

Image of a Graphene Pixel that changes color with shape.