Blizzard is the combination of Amelanism and Charcoal (Anerythrism type B) so you need to start with parents that, between the two of them, have both of these genes.
Unless BOTH parents are at least het for BOTH of these traits, you will not get any blizzards until the second generation of offspring.
I would recommend using anything that is NOT "Anerythristic type A." Snows are Anery A, along with Ghosts. I would explain in more detail, but it would take a post the length of my genetics tutorial to do so. Read that instead.