Blizzard, blizzard stripe, and whiteout are pretty popular and oddly hard to find sometimes. This is especially true of adults. They tend to get snapped up very quickly. Starting with a simple amel is not ideal, but at least it is a component of blizzard morphs. You could start a nice blizzard project by first pairing your amel male to a striped charcoal or pewter female (esp if she is het amel), and then pairing the resulting hets together (or back to the mother if she is het amel) for a chance of producing the desired morphs. This will take a minimum of 2-3 years starting with an adult female next season, assuming everything goes according to plan (see the Murphy's Law sticky in this forum).
Well-contrasted Miamis are also popular, but you should really start with a group of snakes with strongly-contrasted backgrounds unless you want to take a few decades producing your own line. You could potentially try candycanes, but again, it's going to take several generations to breed the background color back out once you add it.
Not knowing your amel's hets, another option is to throw as many genes at it as possible with several females of various morphs. Unfortunately, unless he came from a breeder known for multi-gene projects, chances are high you might only find hets for very common mutations such as anery and hypo.