Your lovely normal is an "aztec", a pattern variation of zigzag. The exact genetic make-up of zigzags/aztecs is not completely understood, but you can increase the chance of getting them, as well as improving the amount of pattern, by breeding this pattern morph with each other. It must be noted that reproducing this pattern is not 100%. Lavenders are one color morph that has an increased number of representatives of zigzags/aztecs.