http://www.consolediscussions.com/fo...50-gen-t18932/

Check this post out. It's posted by Johnny and it's pretty much straight forward. Just follow the instructions and it should go smooth.. There is no risk of bricking your PSP from doing it, if you did it wrong you just won't see your custom theme.

Now to get more themes on your PSP, you can download them from the website i gave you and just make sure you download the one that says CTF instead of the Flash0 files.

Let me know if you have any trouble or can't figure anything out.