Just remember in all of these examles the base that you are trying to be found for is "Custom Iphone 6 Skin" or something like that...
NOT - Custom IPhone 6 skin Gunmetal, Custom Iphone 6 Skin Back etc.
Having talked about this with the customer I would be interested to know everyones thoughts on how this plays into SEO, deep linking to a product option selection, and if you had different version (aka A Single design on a Hat, A Shirt, A Mug, etc)
Additionally how do your apps control that the user should see the exact selection of the colors / options they have selected when they go to their cart, their order notifications, etc. Do you handle that? From what I can see it will always show always a non-customized image. Do you see impact to the conversion when a user doesn't see what they ordered exactly?