How to make app icons customized on iPhone?

So I was looking on my friend's iPhone and I see she has all her apps in customized fonts, colors, and prints. She told me she got an app, but won't tell me what it's called. I know her phone isn't jailbroken either and it's NOT called cocoppa!

Her phone must be Jailborken, because unfortunately there's no way to change the font in iPhone yet.

  • Will apple replace my iPhone even though its customized? So I got an iPhone off of eBay a few month ago and of course it has some problems like the home button not working properly, the speakers don't work, the promoxity sensor doesn't function, etc. And it wasn't abused or neglected or anything like that. I'm not under warranty so I'm aware of the 149 dollar fee to replace it. But will they let me do that still even though there's a customized pink backing on it?
  • What's the best emoji icons app for iphone? There's alot of them & before I downloaded one & I just wanted to know which one is your favorite?
  • What do the different cloud icons mean on the iPhone Weather app? In the app, there are many different icons which are really quite self explanatory. However, there are two icons that are just clouds - no rain or anything along with it - but different shades of grey. One is dark grey, the other light grey. What difference(s) do these signify?
  • Is there an app that can change app icons? My friend showed me her iphone and the icons looked like an updated version or something. The safari icon was a pink polka-dot background with the compass thing and the facebook icon looked all different. I asked her how she did it but she wouldn't say. Her iphone isn't jail-broken. Is there any way that I can do this with the apple ipod touch 4th generation?