Custom Theme Converter by Sony

Edit: English translated manual released!

Something that no one expected to happen has: Sony has released an Official Custom Theme Converter for the PSP Slim. With this Custom Theme Converter, you can edit the XMB icons on the PSP Slim easily, and your custom theme can be selected in the Theme menu.

Looks like Sony has finally acknowledged that there is a strong interest in XMB customization. It's just too bad that on the PSP Slim you're limited to changing the XMB icons only.

While the application is in English, the readme file is in Japanese. So unless you've had prior experience making XMB icons, you might face a little trouble understanding the steps.

Grab the file from my file archive: Download
English translated Manual: Download