This image is based on my current favorite color: mint green. Mint strikes me as antique, so I turned the image black and white using Image > Adjustments > Black and White. Next, I selected the brush tool and, after setting it to black, "poked holes" in the Black and White adjustments layer, revealing the mint colored nails below. However, in the original image, you see the mint color because your brain has other colors to compare it to. When the rest of the image was black and white, the nails looked extremely orange. For my final step, I adjusted the hue and saturation to make the nails appear mint colored.
(Image based on color of choice)