I still have true old school leopard geckos that have never in their family tree been bred to any sort of morph. Sadly, they're more rare these days than most of the morphs. Even when you do come across what people might call a "normal", it's most likely had some ancestor in it's bloodlines that contained some sort of morphed genetics somewhere along the way. That's exactly what happens when people don't take care to preserve the natural forms and why many serious gecko hobbyists are anti-morph all together.