I'm one of those scrubs who get plain clear super-thin soft rubbery little skin-like cases for like a buck or two. I just want something so that my devices feel more grippy instead of all slippery in my hand... and with a clear one, I can slide a sticker or something printed out in between the phone and case, and it basically kinda laminates it to it. :3
I did it for my niece's phone at one point; she got into the wrapping paper and traced and cut out inserts herself for hers... it was really cute. about every other day, she'd have new patterns and colors on the back of her phone. sometimes she'd do stuff like have kitty paw prints all over it, and make a lil Hello Kitty bow, or do it Kuromi-themed, etc...