Exotic or uncommon materials seem to be all the rage in smartphones right now. Motorola started offering wood backs, then later leather, for its Moto X 2013 and 2014 handsets, respectively. But this wasn't even the first time a phone was offered with some integrated exotic or unorthodox materials. When Apple released the iPhone 4 with a glass rear cover, people flipped - wouldn't it break (yes, it would!), or get scratches (not that much) on it?

But people went for it, and there were more glass-backed phones. And then, there were things like Kevlar, football (?), leather, plastic that looks like leather, and so on and so forth.

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