Hey guys I'm not trying to plug a site or anything but they got some good free themes for PS3 here http://www.ps3-themes.com/
I downloaded the Crysis 3 theme that someone made. The easiest way is to go to this site from the PS3 browser.
Heres the link to the Crysis 3 theme: http://www.ps3-themes.com/gaming/crysis-3.html
Please note, I did not make this theme, so all the credit goes to some guy named aninan-gravvity GREECE. If you guys are interested theres instructions and a program on there to make your own PS3 theme.
Brings a tear of joy to my eye every time I power on my PS3 lol