I work with leather. I make custom leather cuffs from reclaimed leather. I would say that there is a market for a cell phone holder that is unique from anything that would be found regular retail.
My clients appreciate my work, not only for the personal craftsmanship, but for the uniqueness of each item; knowing that no other will have a design like their own. I have duplicity for some of my items. The designs that are duplicated, still have a slight variance, to maintain uniqueness.