If you like them , you could win the themes contained by the site too.
here:http://www.iphoned.cn/You can only apply theme to the iphone if you "jailbroke" it, which is quite an trouble-free straightforward process. You theoretically cancelled your warranty, but if there is any stipulation for you to return the iphone, just restore it to resourceful settings in itunes. If you are already on a jailbroken iphone, after you'll have a general selection of theme in the INSTALLER. Or be in motion to modmyifone.com for more (also a good source to swot about jailbreaking and how to do it).