There are all kinds of different shades and types of construction. Mostly your blues (ie: cobalt, aqua/cyan), ambers, greens, clears. Less common are yellows, oranges, purples. Then red which is considered a 'holy grail' for some collectors. A black one would be cool but haven't seen a true black, just a really deep purple.
Blizzard usually refers to the amount and distribution of the mica. If it's mostly uniform and there is a ton of it close to the surface, than that would fit the definition. Most Mica's have a ghost core as a result of their construction and probably not deliberate.
Mica can also make an appearance on other marbles, like onionskins, peppermints. Not so much on swirls though. This of course is all based on my opinion/experience and I certainly haven't seen them all