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I'll try to help a bit - it all depends on whether your colors are all "pure" or if they're carrying recessive genes that you don't know about!
A - Snowy Drake on White Hen - this is probably going to produce Mallard-colored or Black bibbed ducklings. It all depends on the White hen - white is caused by a double dose of a gene that basically "masks" all other colors - she's carrying the genetics for other colors "underneath" the white. Typically, when I've done crosses with White Calls I've found that a lot of them are Black or Blue Bibbed "underneath" the white. Some are wild-type Grey. She could be carrying literally ANY color under there though, so you'll never know until you breed her. Also, all of the offspring of a White parent will get one copy of the recessive White gene - if you breed the F1 males back to their White mother, you'll get 50% White ducklings, if you breed the F1 osspring together, you'll get about 25% White ducklings. The light phase gene from the Snowy drake will also pop back up in subsequent generations, so a small percentage of the F2 offspring could be snowy.
B - Snowy Drake on Blue Fawn Hen - Theoretically, this will produce Blue Fawn and Grey ducklings.
C - Blue Drake on White Hen - This is probably going to give you Blue and Black Bibbed babies. Again, it depends on what genes the White hen is carrying though. If she has a copy of the Blue gene, you could get some Splash babies too. And again, they'll be carrying a recessive White gene that will pop up in subsequent generations.
D - Buff Drake on White Hen - You'll most likely get variants of Buff, Grey, or Blue/Black/Splash Bibbed, Chocolate Bibbed, Lilac Bibbed...this one could be interesting, depending on the color dilution genes that the White hen is carrying. There's a lot at play in this one. Depends on what the White hens genetics are.
E - Buff Drake on Grey Hen - Variations of diluted Grey - Blue Fawn, Chocolate Mallard, Buff or Lilac Mallard
Again, none of that is 100%, because there are WAY too many recessive genes that could be lurking in there to take into account!
