Fancy is PetSmart's term for any corn snake a given store is sent that isn't normal, albino, or anerythristic. Normal, albino, and anerythristic corns are now lumped under the sale term "assorted". Fancy, thus far that I've seen out here in NM has included:
snow
striped snow
motley snow
caramel
bloodred
motley
albino motley
ghost
ghost bloodred (my store got this in as a ghost, but had clear diffused blotch patterning and the neat spotted head pattern, also came in with an unpleasant head tilt and when excited would stargaze)
hypo (I've seen hypos come in labeled as either fancy and normal corns)
Our store's vendor (Lasco, aka Ty Park) is pretty good about labeling what they send fancy corn wise. At my store we have a dry erase board which I update for each herp shipment, where I state what each fancy anything (we get "fancy" corns, beardies, and leos) truly is. Since we also print out a snake feed chart for every snake, I also make certain I label what the snake morph is to avoid any confusion. This is mainly to avoid selling regular/assorted pets as fancy or vice versa. Example: 3 years ago a Pet Care associate sold a jumbo albino leopard gecko ($99.99) as a jumbo normal leopard gecko ($79.99). Management wasn't happy.
Nothing really else to tell. Care is no different than any other corn snake.