Place theme.p3t file in X:/PSP/THEME/ folder and select theme from XMB->Settings->Themes
X is your psp USB or PSP media card
Or Download Only theme file directly from your PSP internet browser.
Description:
This is my first theme. I made it because CoD4's awesome, and as far as I know, it's the only CoD4 PSP theme. I threw the preview shot together. Trust me, the real things looks much better. I'm missing some of the icons, I couldn't find them. If anyone knows where I can, comment and I'll fix it and re-up it. Hope you like it!
Call Of Duty 4: Modern Warfare 
Nintendo of old remixed
Scrabble_2
