It wouldn't be a new "morph". It would be a hybrid. A morph is a pure cornsnake that has a specific genetically determined appearance, but a cornsnake morph does not have genes from any other species.
Snakes like creamsicles and rootbeers are morphs of hybrids. They are not cornsnakes because they have been crossed with an entirely different species. That would be like crossing a horse with a donkey, and saying you have a new breed of horse when you don't, you have a hybrid called a mule.
It may have some interesting results. Personally I don't think it will be that spectacular as house snakes are pretty plain looking, but you never know.
Personally I really dislike hybridization in general. It may come to a point in the future where some of these species we keep in captivity only exist in captivity. I feel that it is our responsibility to make sure we preserve the genetic integrity of the species in our care. It's not as big of a problem with corns as they are so common in captivity and the wild, but with the less common reptiles and even birds, it becomes more urgent.