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MUST READ: 2013 in tech: What a year
While some Android phones don't have this feature, the Samsung S4 has a back that you can easily replace. Even better, unlike my old iPhone 4S, the new Android phone does not have a back made of easily-breakable glass.
In fact, you can replace the of the Samsung S4 with hundreds of others, in all sorts of different patterns and colors. These are quite inexpensive, so if you do happen to do some damage to the back of your unit, the replacement cost can be under ten bucks. Now, that's progress!
Image courtesy Amazon and "I Need" specialty shop.