Some people might say that decorations only go as far as your house. That's not what I say, I say that it can expand out to anything, even your phone. Phone cases are a good way to do that.
Here is a picture of an IPhone without a case.
Here is an IPhone adorned with a case.
These are two cases that I really want for my phone. You can see that the case makes a world of a diversity to your phone.