The colours of a budgie are incredibly complicated, so i will try to keep this brief. The dominant colour is green. This means if you breed a green budgie with any other colour chances are all the chicks will be green. But they will actually have the other birds colour in its blood, therefore they will need to be breed with a bird the same colour as its coloured parent. Eventually some of the chicks will start to be coloured. You need to breed a green bird into the line, as it is the green bird is the biggest bird that you will get and you will need the size in the line.
But some of the colours of the budgie are incredibly pretty and colourful. You can have a pied bird, which means that it has two or more colours. There are two types of pied birds there is the recessive pied and the dominant pied. The recessive pied budgie has completely black eyes a looks more plain than the dominant, which has a white ring around the pupil in the eye and looks far more grand than the recessive.
Other colours include: purple, blue, green, albino, lutino, mauve, yellow, grey an many others. All bird can have different coloured heads yellow or white. It is very pretty when a blue bird, which will usually have a white head, has a yellow.
As i said above you will need to breed a green bird into a line as it is the biggest bird that you will ever get and you will need it in the line to keep the birds of a reasonable size.
On the previous page the table shows you how to breed the larger green birds into the line. Yet have larger blue or other coloured birds. The table shows in year 1 breeding the green with a blue budgie. The next year shows breeding a second blue bird with the previous years chick. The chick will be green but contain blue genes. SO breeding it with a second blue will strengthen the blue gene.