Downloading themes for your mobiles
You can have fun changing your mobile's themes, colors and appearance! Themes can be downloaded from many websites,free or not...
Mobile 9
Mobile 9 is a free mobile phone portal specialized for phones customization with an approximate of 6000 themes, ringstones, wallpapers etc. You can access this website on below link:
http://gallery.mobile9.com/
Zedge
Zedge is another website suggesting the same free services of mobile stuff and direct download to your computer. Click on below link to access this website : http://www.zedge.net/
Moreover you can access directly website of your corresponding mobile phones and download themes which may however be payable.
Taking Sony Ericsson as example, this mobile supplier offers a wide range and varieties of themes and other extra features for customizing your mobile phone which is unfortunately allocated.
emobilez.com
A cool site providing free themes, wallpapers , java software for your , nokia ,sony ...etc phone.
http://www.emobilez.com/themes/cat-nokia-6600-themes-5.htm
ownskin.com
A good website that provide you options like:
*Download themes directly to your PC or via WAP
*Download themes for numerous phone brands and models
http://www.ownskin.com/
Directly from your mobile
Apart from a special offer (free download), the service is generally paid, through instant messaging. You can also access internet directly on smartphone. It is good to note that despite it is not free, the price is quite cheap and affordable and there are even unlimited packages 
Download a window xp theme which personilize my pc in free