From Torch:

Credits:
Big time thanks to Dark_Alex for his VLF library, without which this would have been impossible. Also thanks to him for his idea of using a kernel mode loader.prx to save memory.

Features:
Now uses the XMB Wave as the background.

Warning:
This can brick your PSP if improperly installed or due to bugs as it is a BETA.

Installation:
Copy the following files to the flash0:/ root directory.
lockdown.argb
intraFont.prx
iop.prx
vlf.prx
loader.prx

Rename flash0:/vsh/module/vshmain.prx to vshmain_real.prx
Copy the included vshmain.prx to flash0:/vsh/module/

Reboot the PSP and verify that it is working. If everything is fine, then proceed to do the same for recovery.prx if you want to protect the recovery menu as well.
Rename flash0:/vsh/module/recovery.prx to recovery_real.prx
Copy the included recovery.prx to flash0:/vsh/module/

Note:
To change the color of the wave you can hex edit address 0x1D8 and change the value corresponding to each month (in hexadecimal).

Presently the theme file is called lockdown.argb and is not compatible with Lockdown v3.0 themes as the current version can only load ARGB uncompressed BMPs. The graphics used are included to help make custom themes.

Quote:
Changelog BETA-2:
Fixed a problem where ISOs would not show up in the XMB.