Copy the 'CXMB' folder to the root of your memory stick.
In your 'SEPLUGINS' folder open 'VSH.txt' (create SEPLUGINS folder and text document file name VSH if you don't have, ).
Add the line 'ms0:/cxmb/cxmb.prx 1'. For PSP GO use this line 'ef0:/cxmb/cxmb.prx 1'.
Choose your desired theme and put into 'PSP/THEMES'.
In the main menu of your PSP press SELECT, now your on the VSH MENU, select 'RECOVERY MENU>PLUGINS' and enable 'cxmb.prx' now press back button and select 'RESET VSH' and your PSP will reboot.
Go to the 'Theme Settings' and choose the theme that you put. Enjoy!
CTF Themes for 6.60
Clear XMB Black
Clear CXMB Black 3D [here]
Clear Oxygen [here]
Blue Flame [here]
Dynamic Glow [here]
Golden Witch [here]
Allure v2 [here]