Thanks Kim and Deanna!
"Pied" is a random color reduction mutation. The places on the bird the color is reduced is random, as well as how much color is reduced in those places. So parts of the bird can be diluted just a little and other parts can show completely clear, exposing the birds base color. Pied is a work of art, each one is different! That's why I love them so much!!!
If you scroll up and look at the photo of the Fischer parents, the Daddy is Pied. You can see he shows variations of blue and white on his wings. Below is King Elessar, another one of my Fischer Pieds. At a show, they judge Pied against the Regular Lovebird Standards, as well as the amount of Pied the bird shows and the symmetry in their markings. King Elessar won his Class and Section at one of the shows...he's a gorgeous example of the amount of Pied judges want to see, and pattern symmetry.