Sure you're being more original if you have a "unique" case for a device that millions of people have.
Choices are probably quite limited, no? If not, let your creative mind walk it's path
Nope. It's one way to express it. I wouldn't say it's the best way. IMO the best way to express anything about you doesn't involve buying products, despite what our consumeristic society seems to think. I suspect this is part of why fanboyism is so rampant though it may be a chicken-or-egg matter.