I am pretty sure most of you already know. But for those who doesn’t know how to create your own theme for your BlackBerry you can take a look to the article Just theme it
Code:
http://us.blackberry.com/developers/themes/devtools.jsp
RIM
Code:
http://www.rim.com/
What can you do with Theme Builder? Some of its main features allow you to:

* Customize the BlackBerry application icons
* Change the Home screen banner image and icon/indicator colors
* Create your own buttons
* Customize the look of dialog and pop up screens
* Customize an idle screen
* Customize the look of menus and lists
* Customize the phone application screens
* Customize fonts used on the BlackBerry device

And the result may look like this:



Developer Journals - Just theme it! by Mark Sohm & Patrick Strack, Research In Motion