Tested by myself on both 5.00m33 and 5.50Gen D3 all works!
Firmware's Supported!:5.00M33, 5.50, 6.20, 6.35, 6.37, 6.39
Screenshots




Converted with CTF Gui

Features:
GAMEBOOT,
CLICK SOUNDS
ICONS
VISUALIZER
VOLUME
COLDBOOT
AND
SOUTH PARK FONT!!!

All theme versions are included in the same download/archive.

Credits To:
Mudbone-for original icons.
The rest by me
And Everyone That Helped Me Way Back In 2008! At ConsoleSpot.

For Those of you who download this Theme.
You will notice that the far left icon has a black
smudge on it(error)

To solve this go to Theme Settings
select Theme
scroll up to original theme
and select
scroll down to color
and select
now scroll down until you see an image as an icon
and select
now turn your psp fully of
then turn on again!
As you can see now all the icons have a light black shadow
instead of that nasty black smudge on the far left icon.

Sorry about that, I created this back in 2008 but I hope you all enjoy it all the same!
Hope you like it.
Download
File SPTT.ctf is the 5.00m33 theme.
DVL300 aka Mastercodec.