Um... not every snake has been produced. There are offspring which do not have images.
Remove piebald from your searches, it's not hard to guess what a morph will look like when you add piebald to it. There are pewter bananas, though.
So, yeah, don't get your hopes up that everything already exists, because they don't. There are almost 300 base morphs (counting lines), which means there are about 8 billion 4 gene combinations. Only a few thousand designer morphs exist.