To be fair, not all her keys were doubleshot. At least, with these pictures they haven't gained our ire.
This type of art is very "digital". It's just a methodology. Go find images. make them all small, run them though a program to sort them based on major hue (looks at the histogram, etc.) Find an image to make out of them, assign "hues" to blocks on the larger image. Publish.
That said, it's still rather aesthetically nice.