If you're like me, you download a lot of Blackberry themes trying to find the perfect balance between style and function then end up deleting all of them in frustration, then download them all again a week later, yeah I know. Usually one theme has the right color scheme but the fonts suck, the right combination of today screen items but not enough icons, you get my point. What to do, what to do, well you could create your own theme but who wants to go through the hassle of learning how to code.
In comes Blackberry with Blackberry Theme Studio, the first full feature theme building software from the manufacturer. As the name implies, this software allows you to build custom themes to use on your Blackberry, so finally you can make that really awesome Scooby Doo theme you've been conjuring in your mind. Assuming you have a Blackberry device with OS4.2 or higher and a couple hours to spare you can start by downloading Blackberry Theme Studio Here. Then I would suggest reading Part 1 and Part 2 of RIM's theme building tutorial.
After that the world is yours, chico and everything in it.