For your convenience, I have worked out a few combinations of various mutations and written them down. If you find an error in my calculations, please send an email to robert@quarrion.com.

Pairings with the Whiteface, Pastel Silver & Pied mutations

Pairings with the Whiteface and Lutino mutations
 

If you are wanting to learn about genetics, some good sites are:

• The Cockatiel Cabin - Cockatiel Genetics
  http://members.tripod.com/~Cockatiels4U/algenetics.htm
   
• North American Cockatiel Society - Cockatiel Genetics
  http://www.cockatiel.org/genetics
   
• Cockatiel Genetics for the Beginning Breeder
  http://www.upatsix.com/fyi/tiel_genetics.htm
   
• American Cockatiel Society - Cockatiel Color Genetics
  http://www.acstiels.com/cockatiel_color_genetics.htm