how to quickly pick a color

It used to take me a long time to figure out which color I wanted to paint my nails, as I would just dig through the box pulling out bottles, putting them back trying to find the perfect shade.  But then I ordered these nail tester wheels really cheaply from China and it has made my selection process a lot faster.  I can also use them to test out patterns and combinations. I wrote the names of the colors on the back of the wheels.

The following images are not great but you get the idea, a great way to quickly go through your colors before painting.