Captive breeding has resulted in several colour mutations. Mutations vary by country, with some existing only in Australia (the Australian yellow and the Australian "dilute") and others existing in greater number in the United States, such as the blue bodied Gouldian. The most common body mutations in the United States are blue, pastel green (single and double-factor, resulting in "dilute" and yellow males and yellow females), and pastel blue (again, single and double-factor producing "pastel" and silver males, and silver hens). There is also a lutino and albino mutation in the United States, established by Winnie McAlpin of Delmar Aviaries.
This page contains all about Lady Gouldian Finch Eggs.