I've previously seen tutorials like this one, where by using simply one clear phone case you can cheaply customise how your phone looks.
Before you start you will need;
~ A clear phone case,
~ A selection of patterned card or paper (card is best, and I used pieces of scrapbooking card),
~ A pencil,
~ And a craft knife and cutting board.
Firstly take your chosen paper/card and flip it over. In order to reduce the amount of waste, position your phone case at one of the corners. Then simply draw around the case but don't forget the camera hole.
The next step is to cut out your phone case shape. (Remember to place your cutting mat, and cut on a flat surface to avoid slipping.) Don't forget your camera hole!
Once these easy steps are completed make sure your card fits into the back of your phone case (if it doesn't, cut small amounts off the edges and it should fit. Then depending on how many phone case designs you want, experiment!!! Happy Crafting!x